I really like how Johto added Ho-Oh as a boss raid I was wondering if it's possible to add boss raids to every legendary spot in every region and be able to repeatedly fight them for fun and make it uncatchable like ho-oh.
Make 'em lv100, with good movesets, perfect IVs/EVs, and a good AI, too, just to put a bit of challenge into it! With mobs on the side like Ho-Oh, eg.) LUGIA with Zapdos Articuno and Moltres just like how ho oh had the legendary dogs.
This will bring nostalgia of fighting legendaries without affecting the economy or balance because u won't be catching them.