Houndoom

Houndoom has fallen from grace, as the metagame has been unkind to it, especially with the rise of Mega Aerodactyl and Feraligatr, coupled with the prevalence of Hydreigon. However, it doesn't make Houndoom any less of a threat, as it still has an amazing Special Attack stat and a good Speed stat. It also has access to the coveted Nasty Plot, which makes it a very deadly sweeper, while its Mega Evolution's ability Solar Power makes it an amazing wallbreaker in the sun. It has a lot of support options in its arsenal but can't utilize a majority of them. Houndoom also has a unique Dark / Fire typing, which allows it to resist both of Chandelure's STAB types as well as only take neutral damage from Fairy-type attacks in spite of its Dark typing.