In Meteor's Edge, we allow for Pokemon to fuse with the usage of Meteorites! These Meteorites come in various sizes, ranging from just a fragment of them to entire Meteorites - the size of the piece will determine what rarity Pokemon will come from the fusion!
Each Pokemon has the potential for two species - this is broken into a Primary Species and a Secondary Species. The Primary Species of a Pokemon will be the primary characteristics that they will have and is the species they start at, while a Secondary Species will be additions and be the species added with a Meteorite. Think of an Eeveelution fused with a bipedal Pokemon still being quadruped without the use of mutation items!
Palette changes to match the fused Pokemon are also acceptable, so long as they follow normal design rules!
Examples of designs that would pass as fusions:
Currently, fusion is the only way to obtain a Legendary Pokemon!