Vaporeon

Toxic

Ice Beam

Surf

Dig/Iron Tail

Floatzel

Surf

Crunch

Ice Fang

Dig/Brick Break/Iron Tail

Which should i pick for my Platinum team of:

Torterra

Arcanine

Lucario

Dragonite

Gengar

- - - ?

Just need a water type and was wondering which one is better and which would suit my team more effectively. Thanks! Best answer gets 5 stars :D