I Have the Answer to Mega Malamar

ok

Also is it the school itself or everything after Season 7?

I come back saying fine I still am one with darkness but darkness flows with waves and it will crash toward your destruction

well then I will control the waves imitating my old form and to cleanse away the darkness from you to sweep me into it regaining my darkness

Luckily, I have no physical form and get away from this completely unaffected. I blast your entire team away simultaneously with a gigantic light 2 sphere.