Turn a third-stage evo that isn’t a pseudo-legendary into one

Starters are excluded from this

Example:
>Aggron’s Old Stats
75 HP
110 Atk
180 Def
60 SpA
60 SpD
50 Spe

>Mega’s Old Stats
75 HP
130 Atk
230 Def
60 SpA
80 SpD
50 Spe

Aggron’s New Stats:
85 HP
115 Atk
180 Def
60 SpA
105 SpD
50 Spe

>Mega’s New Stats
85 HP
135 Atk
230 Def
60 SpA
125 SpD
50 Spe

Giving it a Steel/Dragon typing wouldn’t hurt, but for the sake of the thread let’s keep it at stat changes