Out of all the moves Mega Launcher works with,with the exception of Aura Sphere, it's easy to see that Mega Launcher will have minimum impact. We won't be giving it Water-type coverage due to having fire-types as a check/counter. Dragon Pulse seems highly unlikely and Heal Pulse is, like the number 5, right out. Dark Pulse is probably the only thing that could be added on as coverage that Mega Launcher would be a strike against, and that could be something we want to avoid anyways.
Meanwhile a 50% boost to Aura Sphere would give it a 120 base power, so it would be about the same as No Guard Focus Blast regardless, just without an interactions that could make us not want to consider some other moves.
Mega Launcher seems fine.
Regarding what
snake_rattler said:
Aroma Veil and Mold Breaker could allow for more supportive moves being used on a set without worrying about Taunt or abilities preventing them from happening. This could allow for more variance in sets, which would help with the unpredictability. That said: I do believe something like
Reckless would help more on that front compared to No Guard and Mega Launcher since it involves a move we haven't assumed would be on most sets yet: High Jump Kick. The fact that it would be ill-advisable with Natural Cure gives it a nice clarity in purpose too.