>>33690326BYOND senpai. The game is multiplayer and there isn't much focus on the combat (it takes place in the overworld and essentially boils down to bumping into your opponent) - it's more about solving puzzles/running dungeons for rare items/Pokémon and getting ranks like GL/E4.
My co-dev and I grew up on and met each other on similar (but cruder) social Pokémon fangames from BYOND. They're all gone now so we're trying to create a more polished spiritual successor.
tl;dr BYOND is the engine, then a blog post.
>>33690334I'm assuming you're referring to the player sprite since the PMD sprites are just the default ones (~32x32 depending on the Pokémon) and the RSE tiles are just upscaled to 32x32.. not much we can do about the player graphics anon, upscaled RSE Brendan/May don't fit in.