The Fire/Flying type dragon is a safe bet to return in Smash Switch. And I thought no picture better exemplifies the character than this one. Charizard is my second-favorite of Ash's Pokemon in the anime after Pikachu, although I liked the dragon better as a rebel. Since SSB4 I think it has been this very Charizard that has been in Smash, following Pokemon Trainer's departure (much like we've been playing as Ash's Pikachu since 1999).
Charizard is still one of the most popular of the original 151, and one of the most popular overall. An addition I'd like is a palette swap which colors him like Toothless from HTTYD.
Charizard fans, let your voices be heard!
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