Could Celebi be a Time Lord or a unicorn? Maybe both? It travels through time, and nature thrives wherever it appears. This loving Pokémon's so perfect, it doesn't even need to evolve!
Why don't we take a moment to admire the five most valuable shinies:
"Can't knock me out. I'll just rewind time!"
Willing to sit on the bench to let an old buddy play? What a team player!
This Celebi really knows how to throw some Shade!
It is worshipped as a god of the forest. It appears only in undisturbed old-growth forests. Based on a kodama (Shintō tree spirit), this makes sense!
Pick a color! (Almost) any color! Now heal your buddies.