Kecleon

Color Change
Changes user's type to type of last attack that hit this Pokémon.
Type Tier
Normal NU
Level 5 Statistics (see level 5, 50, 100)
Min- Min Max Max+
HP
60
- 22 25 -
Atk
90
13 15 18 19
Def
70
11 13 16 17
SpA
60
10 12 15 16
SpD
120
16 18 21 23
Spe
40
9 10 13 14
Name Item Nature

RestTalk

Leftovers Careful
Moveset EVs
~ Rest
~ Sleep Talk
~ Return / Double-Edge
~ Brick Break / Iron Tail / Hidden Power Steel
252 HP / 252 Atk / 4 SpD

Kecleon has a high Special Defense stat, and can use this to wall most special attackers like Electabuzz (without Cross Chop, which few have in UU). Double-Edge is an option because you are using Rest to constantly restore your HP, but recoil still hurts on 324 max HP. The last slot is mostly for Rock Pokémon. Brick Break hits Aggron on its 4x weakness, rather than neutral, while the Steel move hits Solrock and Lunatone, as well as any Misdreavus and Sableye you may encounter. Iron Tail vs. Hidden Power Steel is really just a question of power vs. accuracy.