Mew

Boasting base 100 stats across the board, Mew stands in the metagame as a fast, bulky, and niche supporter. Mew's claim to fame is its ability to Transform into any Pokemon on the field, particularly boosted teammates such as +6 Belly Drum Azumarill; Transform allows Mew to apply intense pressure on the opposing team by being able to turn into another boosted threat on top of its already-boosted partner. Mew also has access to nifty support moves, such as Tailwind and Will-O-Wisp, letting it back up its team outside of using Transform.

Outside of Transform and its ability to support its team, Mew is a horribly niche pick; it should only be used as a glue and role compressor for filling several niches as a last resort due to being mediocre overall. Mew usually lacks an offensive move besides Fake Out, leaving it extremely vulnerable to Taunt and forcing it to rely on acquiring attack moves via Transform to deal damage. Mew can be a momentum killer on the field due to its difficulties with strong, fast Pokemon, as they are able to heavily damage it with ease.