Seedot

Seedot (Japanese: タネボー Taneboh) is a -type Pokémon introduced in Generation III.

Physiology
When it dangles from a tree branch, it looks just like an acorn.

Evolution
Seedot evolves into Nuzleaf at level 14. Then into Shiftry when given a Leaf Stone.

Trivia

 * Seedot is the only Pokémon that can learn Explosion of its evolutionary line, yet Nuzleaf and Shiftry can't.