Xhampi
Smash Lord
Most people forget about it since Little Birdie himself does not appear in the boss fight itself.Yeah, most of these like the physical stuff and anything from Other M I already knew, I was more focused on Special Moves.
It'd be neat for him to have Ice Breath, but I doubt they'd pull from Nintendoland. I had forgotten about the summoning though, but I honestly don't think it'd fit him very well for a move in Smash.
But yeah, Ridley don't really have many outstanding attacks in his arsenal, those who do are usually specific to one form or machine.
Regular Ridley battles are the Metroid equivalent of the fights against Bowser where you have to press the switch to make the bridge fall, it's the iconic boss formula that you've beaten several times between the hero and it's archnemesis, no other new gimmicks are or should be needed.
The problem here is indeed that it doesn't give much attack diversity for Ridley to use, but I'm not too worried personally, Sakurai can always give him new moves.It also of course doesn't mean that we can't come up with something ourselves in the meantimes but that's one of the reasons why Ridley fans talk less about "what moveset" and more about "what playstyle" ?