Trimming its fluffy fur not only makes it more elegant but also increases the swiftness of its movements.
– Pokémon X Pokédex
Furfrou is a Pokemon that does not evolve, or evolve from anything. Its main gimmick is that it has 9 different appearances (not including the Natural Form), by having its fur trimmed (a reference to poodles getting their furs styled). A trimmed Furfrou will revert into its Natural Form if five days have passed since it was trimmed without being deposited in the PC, or if it is deposited in (Generation VI) or withdrawn from (Generation VII) the PC. It’s a purely aesthetic form change; despite what its Pokedex entry says, its stats are unchanged in the trimmed forms)
It used to have a unique ability, Fur Coat, which halves damage from physical attacks. It has since been also given to Alolan Persian.
Stat-wise, it has good Speed and decent Attack. It only has 60 Defense, but factoring in Fur Coat, it actually has pretty good defense.