Wigglytuff

Type Tier
Normal UU
Statistics
Stat
HP
140
483
Atk
70
238
Def
45
188
SpA
75
248
SpD
50
198
Spe
45
188
Name Item

Mixed Attacker

Leftovers
Moveset
~ Double-Edge
~ Ice Beam
~ Thunderbolt
~ Thunder Wave / Counter / Sing

Ice + Electric isn't resisted by much, and can be super-effective on whatever Double-Edge isn't. The last three moves each have their own benefits. Thunder Wave and Counter are your best options here, though Sing is unexpected. If you decide on Counter, you might want to opt for Return over Double-Edge.

Other Options

Wigglytuff has one of the best movepools in the game. Fire Blast can hit Steel-types hard. Curse can patch up his subpar Defense, and can be used in conjunction with Rest and/or Shadow Ball. Body Slam can paralyze things, and Charm will ruin strong physical attackers when they switch in.

Opinion

Great movepool, but outshined by Clefable in every way. It doesn't have a recovery move, and it can't sweep with Belly Drum like Clefable can. It is decent in underused, however, because for the most part, move versatility is more important than attack strength. Even so, Clefable can play the attacking spectrum better.

Counters

Suicune can take anything it throws at it (even a few Thunderbolts from Wiggly's pathetic Special Attack). Raikou, Ampharos, Tyranitar, Umbreon, Tauros, Forretress, Kangaskhan, Snorlax, Steelix, and Scizor can all take Wiggly out before it gets a chance to do anything back (with the obvious exception of Umbreon.)