Whenever a Pokémon has a built-in forme and its forme changes, the tooltip's raw Speed stat range accomodates for that. This is the case for Mega Evolutions and Pokémon like Darmanitan and Meloetta, for example. However, in Mix and Mega formats, when a Pokémon Mega Evolves, the tooltip does not change the range of Speed a Pokémon could have.
For example, in a battle with Aerodactylite Urshifu, the tooltip shows this before AND after Urshifu mega evolves:
Even though Aerodactylite Urshifu gains 20 points in its base Speed stat after Mega Evolving (and its new Speed range is 215 to 366 before items/abilities/modifiers), the tooltip still shows the same Speed range.
I propose that the game should calculate a Pokémon's new base Speed whenever it mega evolves, and update the Speed range in the tooltip accordingly. The game can already calculate an MnM Pokémon's base stats (/mnm <pokemon> @ <stone>) and a way to calculate raw maximum/minimum stats for any base stat (/statcalc lv100 <basestat> positive 252ev, /statcalc lv100 <basestat> 0iv negative 0ev) so this is a feasible feature that will be very convenient and helpful for new players.
For example, in a battle with Aerodactylite Urshifu, the tooltip shows this before AND after Urshifu mega evolves:
Even though Aerodactylite Urshifu gains 20 points in its base Speed stat after Mega Evolving (and its new Speed range is 215 to 366 before items/abilities/modifiers), the tooltip still shows the same Speed range.
I propose that the game should calculate a Pokémon's new base Speed whenever it mega evolves, and update the Speed range in the tooltip accordingly. The game can already calculate an MnM Pokémon's base stats (/mnm <pokemon> @ <stone>) and a way to calculate raw maximum/minimum stats for any base stat (/statcalc lv100 <basestat> positive 252ev, /statcalc lv100 <basestat> 0iv negative 0ev) so this is a feasible feature that will be very convenient and helpful for new players.