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Assuming you consider Prismatic Laser in this group, it's going to heavily favor fast sweeper types who have the muscle to ensure a KO.
Ash-Greninja having spammable 150 BP water move isn't something I enjoy seeing, especially if you give it rain. It can OHKO anything in Pokemon that doesn't resist water, no matter how bulky, and does insane damage even to bulky resist:
252 SpA Choice Specs Greninja-Ash Hydro Cannon vs. 248 HP / 52 SpD Giratina in Rain: 254-299 (50.4 - 59.4%) -- 82.4% chance to 2HKO
252 SpA Choice Specs Greninja-Ash Hydro Cannon vs. 252 HP / 4 SpD Zygarde-Complete in Rain: 645-760 (101.4 - 119.4%) -- guaranteed OHKO
A-Gren and Pogre ran amuck in BH with Water Spout and Water Bubble. They were so strong, they didn't even need rain.
252+ SpA Choice Specs Water Bubble Greninja-Ash Water Spout (150 BP) vs. 0 HP / 0 SpD Palkia in Rain: 292-344 (90.9 - 107.1%) -- 43.8% chance to OHKO
