To defeat the Sunnycide, you must crack open it's eggs and yoshis will come out and start pushing a chomp rock that was perched on a cliff above the sunnycide, one yoshi can't push it by itself, so five yoshis are needed, once five yoshis are pushing the chomp rock, the rock will roll of the cliff, land on the sunnycide and tip it down onto it's back, exposing it's weakspot (it's bandage-covered tongue), then's your chance to attack! The Sunnycide will be able to get back up, before you repeat the cycle and do a total of 480 damage to it.
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If you are talking about sunnycide, the boss in Yoobs belly then all you do is free the yoshi`s that where pushing the boulder, then once you have thay will use another boulder to knock over the monster for 2 turns,then u just need to attack the Sunnycidefor the turns, then repeat! I hope this Helps ^_^
you fight it and defeat it w/ ur Pokemon
BuG TyPe CaN dEfEaT a DaRk TyPe
Some people can defeat him using the Rust bucket class
Just keep hitting him until you defeat him.