Once you drive Team Plasma away from Seaside Cave you'll more or less have them on the ropes. There's only one more place you need to face the villains down, and that's at Giant Chasm. You can reach it via the cave entrance on the west end of Route 22, outside Humilau City.
Giant Chasm Pokémon (Interior)
- Basculin - Common, Surfing / Whirlpool, All Seasons
- Clefairy - Uncommon, Walking, All Seasons
- Delibird - Rare, Walking, All Seasons
- Dewgong - Rare, Whirlpool, All Seasons
- Excadrill - Common, Dust Cloud, All Seasons
- Lunatone - Rare, Walking, All Seasons
- Piloswine - Uncommon, Walking, All Seasons
- Seel - Common, Surfing, All Seasons
- Sneasel - Uncommon, Walking, All Seasons
- Solrock - Rare, Walking, All Seasons
- Vanillish - Rare, Walking, All Seasons
- Audino - Common, Rustling Grass, All Seasons
- Clefable - Rare, Rustling Grass, All Seasons
- Clefairy - Uncommon, Walking, All Seasons
- Delibird - Rare, Walking, All Seasons
- Ditto - Rare, Walking, All Seasons
- Lunatone - Rare, Walking, All Seasons
- Mamoswine - Rare, Rustling Grass, All Seasons
- Metagross - Rare, Rustling Grass, All Seasons
- Metang - Rare, Walking, All Seasons
- Piloswine - Common, Walking, All Seasons
- Solrock - Rare, Walking, All Seasons
Team Plasma Grunt
- Weezing, level 47
- Muk, level 47
Reward: 1,880 P
Defeat the Grunt and Rood will rush up to give you a handful of Max Revives. Hugh will rush off, and you'll need to give chase. Check the grass patch to the west for a Razor Claw, then check the grass to the north of the two Team Plasmas for a Moon Stone. These are the only patches of grass you can access until you drive Team Plasma out of Giant Chasm, so if you want to catch any Pokémon this is the place to do it.
Climb onto the icy heights to the right and slice your way to the entry ramp of the Plasma Frigate. Yes, you're here again, and yes, this is the last time. Climb aboard and you'll find Hugh, holding down four Grunts on his own. Good man. You already explored the north end of the Frigate during your previous visit, leaving the door on the south end. Immediately inside you'll be ambushed by two Grunts.
Team Plasma Grunt and Team Plasma Grunt
- Scraggy, level 46
- Scrafty, level 46
- Whirlipede, level 46
- Trubbish, level 46
- Golbat, level 46
- Garbodor, level 46
Hop on the nearby teleporter. You'll wind up near another Team Plasma mole. He'll explain that the way through the Frigate is again blocked by electrical barriers, and you'll need to circumvent a maze to deactivate the barriers. How you do this depends on the version of the game you're playing.
Plasma Frigate - Black 2
To bypass the energy barrier in Black 2 you need to learn a password. Each component of the password is known by one of the members of Team Plasma. Fun times. The path splits to the left and the right, and you'll face a trainer regardless of the path you take. The Grunt on the left knows a part of the password.
Team Plasma Grunt (right)
- Krookodile, level 47
Reward: 1,880 P
Team Plasma Grunt (left)
- Skorupi, level 45
- Foongus, level 45
- Golbat, level 45
Reward: 1,800 P
The 'maze' consists of a series of platforms, connected to one another by retractable pathways. Hitting the red switches on a few of the platforms will change the configuration of the maze, opening paths along the platforms while closing others. The retractable pathways also serve as barriers, and you can climb down to the lower floor to access more trainers. Let's get through this maze one step at a time:
- Take the right path onto the platforms and hit the button on the first platform. Take a left to find a Zinc to the north of the central platform.
- Head to the east side of the room and go down the stairs. You'll find Team Plasma Grunt 1. Grunt 1 has a part of the password.
- Get back onto the platforms and head south, to the other end of the room. You'll find a large section of flooring with Grunts 2 and 3, as well as Doctor Julius. Check the left side of the platform for a Max Revive and a Max Elixir.
- Go down the right stairs near the Doctor. You'll find a path to a Power Band down on the lower level.
- Go down the left stairs near Grunt 3. Head north along the lower level and you'll find Grunt 4. She has the Plasma Card, which you need to enter the password.
- Return to the southern platform and get onto the pathway on the left. Trigger the first switch to open a path to the western section of the lower level. You'll face Grunts 5 and 6 down here. Both Grunts provide hints for the password.
Team Plasma Grunt (1)
- Grimer, level 46
- Seviper, level 46
Reward: 1,840 P
Team Plasma Grunt (2)
- Raticate, level 47
- Watchog, level 47
Reward: 1,880 P
Team Plasma Grunt (3)
- Krokorok, level 47
- Krookodile, level 47
Reward: 1,880 P
Doctor Julius
- Leavanny, level 47
Reward: 1,880 P
Team Plasma Grunt (4)
- Trubbish, level 46
- Zangoose, level 46
Team Plasma Grunt (5)
- Scolipede, level 47
Reward: 1,880 P
Team Plasma Grunt (6)
- Scrafty, level 47
Reward: 1,880 P
Though it's not a bad idea to go through the entire maze and fight every Team Plasma Grunt, you only need the Plasma Card and one of the numbers to complete this puzzle. Head back north to the start and you'll find the console where you can use the Plasma Card and enter the password. The password will be either 1101, 2202, 3303, 4404, 5505, 6606, 7707, 8808, or 9909. Whichever number you see via the hints from the Grunts will fill in the blanks.
Plasma Frigate - White 2
The maze puzzle in White 2 is quite a bit different, though it still involves a moving maze. In this case you need to activate four switches to lower the energy barrier, and they're accessible via the yellow teleportation pads on the lower level of the moving platforms. You'll need to use a combination of upper button presses and the teleportation pads to get them all:
- Take the lower-right path from the north and get onto the moveable tubes. Cross to the south by hitting buttons. You'll find the Doctor and a few Grunts down here.
- Go down the stairs near the Doctor and take the teleport pad on your left. It will shoot you to a section with two Grunts and two more teleport pads. Both of them will take you to buttons to press. Hit them both.
- Backtrack to the Doctor and cross the tube platforms to the east. Activate the button that will move the tube on the floor below into a vertical configuration rather than horizontal.
- Go down the stairs and step on the second teleport pad to the north. You'll find the third button.
- Return to the southern platform and use the eastern tube to walk north. Hitting the button will create a path to the east side of the room, where you'll find stairs. The Grunt at the bottom of the stairs is guarding a teleport pad that leads to the final button.
Team Plasma Zinzolin
- Cryogonal, level 49
- Cryogonal, level 49
- Weavile, level 51
- Magneton, level 50
- Beheeyem, level 50
- Metang, level 50
- Magnezone, level 50
- Klinglang, level 52
- Pawniard, level 49
- Pawniard, level 49
- Absol, level 51
- Pawniard, level 49
- Pawniard, level 49
- Banette, level 51
- Pawniard, level 49
- Pawniard, level 49
- Accelgor, level 51
- Cofagrigus, level 50
- Seismitoad, level 50
- Eelektross, level 50
- Drapion, level 50
- Toxicroak, level 50
- Hydreigon, level 50
- Dark-type Pokémon will do well against Cofagrigus
- Grass-types will slaughter Seismitoad, though watch out for Sludge Wave
- Eelektross floats thanks to Levitate, so neutral moves are your best bet
- Drapion and Toxicroak are both easily dispatched with Ground-types
- Hydreigon can be handled with Ice-, Bug-, or Fighting-type moves, whichever is most readily available by the time it comes out
- On the east side of Giant Chasm is a PP Up. You can get around the trees blocking it by going north a bit and around the debris, then following the line of living trees south.
- In the north is a Sun Stone. To get it you'll need to walk west, follow the cliffs north a ways, then head back east. Check the grass patch to the northwest on your way to find a Carbos.
- In the southeast corner of Giant Chasm is a Star Piece. Wander along the tree line in the south and you can find a thin path through the trees that leads east.
- TM03 Psyshock is sitting in the west, near Rood and two Ex-Team Plasma Grunts. Walk through the lighter green grass behind the Grunts to find the path to the TM.
- If you check the southwest of Giant Chasm, just north of the exit from the initial cave area, you can find a Hidden Grotto. It was previously blocked by a horde of Team Plasma Grunts.