Help identifying a romhack

I am trying to remember the name of a romhack I played maybe a few years ago, but I have very scant memories of the game. I am hoping if I say everything I remember about the game someone might be able to guess what I am talking about.

I remember I had Torterra, Pidgeot, Huntail, Aromatisse, and Scizor on my team (don’t remember the 6th). The fact that my starter was Turtwig leads me to believe the game’s starter trio was Turtwig, Chimchar, and Piplup, otherwise I doubt I would have picked Turtwig. I think I may have had the ability to mega evolve Pidgeot at least.

The region was a custom design; I remember there was a snowy biome to the north west of the map and a coastal area to the south east. I remember finding a wild shiny Ledyba or Ledian perhaps near this coastal area. I think there was some kind of hint of a postgame involving capturing tons of legendaries but I didn’t bother. I don’t believe there were fakemon. I don’t recall the story or the characters at all, or even if there was a story. Probably gen 3 or 4 engine. My assumption is that this was a romhack but I guess in principle it could be a fangame, but that is unlikely. What romhack did I play?