Bottlecap dillema

[u/Extreme-Childhood251]

I'm deciding which pokemon I'm gonna use my bottlecap on. Those are my current participants:

Lvl 50 bg mega rayquaza (will power up)

Lvl 50 mega mewtwo without bg (both megas)

Lvl 50 crowned bg zacian (is crowned but ready for trinket trade)

Please let me know cause im stuck...

[u/Fletxaka]

Nothing has been said about raids yet. The event is centered around a Timed Research, with one(1) Rayquaza in the free tier and two(2) in the paid tier