say that you dont know much about it but your willing to learn be honest but polite

Say that mega shiny rayquaza is peak

nobody in my group knows anything about pokemon but uh for ur situation, lemon's advice is good except, what if you ARENT willing to learn bc it doesnt interest you? just tell them you feel left out when they talk abt pokemon and ask if theres another subject you ALL know and if you arent there when they do it, then good, so you dont feel left out