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Needs Triage Bug Report - Validator

What type of bug are you reporting? Validator

What is the bug?
In the formats Gen 8 National Dex Monotype and Gen 9 National Dex Monotype, Galarian Slowbro is able to evolve into Mega Slowbro on Mono Poison teams, and the teambuilder will say its valid. You're also able to have in Mega Evolve in battles. Yes, I'm aware Galarian Slowbro can do this in other Nat Dex formats, but this shouldn't be allowed in National Dex Monotype as it breaks the rule of a Mega Evolution having to have the same type as the team before and after you mega evolve. Having something like Altaria hold Altarianite on Flying teams will make the validator say the team is invalid, but it doesn't do that when Galarian Slowbro holds Slowbronite on Poison teams.
https://replay.pokemonshowdown.com/gen9nationaldexmonotype-2546050661-8ag7px2t0vrymxekynlowqk36mgptwgpw
(skip to turn 24)
Screenshot 2026-02-24 165624.png

Are you able to replicate it? If so, how?
Make a Mono Poison team with Galarian Slowbro holding Slowbronite and then click the validate button. Also load the poison team with Galarian Slowbro with Slowbronite into a battle to see that you can Mega Evolve it into Mega Slowbro
 
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