Since battles run off of dancing, some of these Pokémon are going to be problematic...
Hoenn and Kanto Contestants: (Only counting those who made it to the Grand Festivals)
May's Blaziken - Could make good combos with other Pokémon, but overall it's best at the battle stage.
May's Venusaur - Sadly too big and bulky... and ugly. There's a reason why Shauna didn't evolve her Ivysaur.
Harley's entire team. Let's face it, he's best when it comes to battling and deception. Most of his team is "too ugly" and poor Wigglytuff only knows Body Slam and Double Slap.
Drew's Flygon - Despite Drew's team looking like they'd be good at dancing, there's probably a size limit that Flygon reaches.
Anthony's entire team. Yeah, I can't imagine a Swalot and a Pinir being good dancers.
Robert's Claydol - Waaaaay too ugly and since it can barely move any limbs, it would make for a terrible dancer.
Solidad's Lapras - Isn't nimble enough to dance on land, so unless they make water contests, Lapras will sadly have to be boxed.
Solidad's Slowbro - For a Pokémon that needs time to warm up, dancing really isn't its forté.
Sinnoh Contestants:
Dawn's Mamoswine - Too big, too ugly and too bulky. Has Mamoswine been dragging her whole team down? If only she kept Ambipom...
Zoey's Gastrodon - Gastrodon't know how to dance.
Kenny's entire team. Let's face it, even if they were good dancers, his team would likely have been disqualified for being too ugly. This is because beauty standards in contests now are WAY too high.
Nando's Armaldo - Well, at least there's always the leagues...
Jessilina's Yanmega - Again, another unfortunate case of strict beauty standards.
You know who I think could excel at contests? Tierno. His whole team was MADE to dance!
Hoenn and Kanto Contestants: (Only counting those who made it to the Grand Festivals)
May's Blaziken - Could make good combos with other Pokémon, but overall it's best at the battle stage.
May's Venusaur - Sadly too big and bulky... and ugly. There's a reason why Shauna didn't evolve her Ivysaur.
Harley's entire team. Let's face it, he's best when it comes to battling and deception. Most of his team is "too ugly" and poor Wigglytuff only knows Body Slam and Double Slap.
Drew's Flygon - Despite Drew's team looking like they'd be good at dancing, there's probably a size limit that Flygon reaches.
Anthony's entire team. Yeah, I can't imagine a Swalot and a Pinir being good dancers.
Robert's Claydol - Waaaaay too ugly and since it can barely move any limbs, it would make for a terrible dancer.
Solidad's Lapras - Isn't nimble enough to dance on land, so unless they make water contests, Lapras will sadly have to be boxed.
Solidad's Slowbro - For a Pokémon that needs time to warm up, dancing really isn't its forté.
Sinnoh Contestants:
Dawn's Mamoswine - Too big, too ugly and too bulky. Has Mamoswine been dragging her whole team down? If only she kept Ambipom...
Zoey's Gastrodon - Gastrodon't know how to dance.
Kenny's entire team. Let's face it, even if they were good dancers, his team would likely have been disqualified for being too ugly. This is because beauty standards in contests now are WAY too high.
Nando's Armaldo - Well, at least there's always the leagues...
Jessilina's Yanmega - Again, another unfortunate case of strict beauty standards.
You know who I think could excel at contests? Tierno. His whole team was MADE to dance!