The amiibo situation continues to be dumb. I have Mega Man and that's all I'm going to go for until there's one for Falco.
And who feels like the metagame for Greninja is way too underdeveloped? Even aside from that there are no really high level players using him in North America, a lot of the discussion on him here and elsewhere boils down to "Greninja has problems in this matchup but his dash grab and up air are good, even matchup." I don't doubt that he has plenty of even matchups, but the explanations for why are often sorely lacking. Which is also part of a problem with Smash Bros discussion in general, but it's like 90% of videos of Greninja are of him losing, so there's nothing to be found there either. Of course, Diddy Kong is pathetically underdeveloped for a character who won 70% of tournaments before the patch, but that's more that there was no reason for anyone to really push Diddy Kong, whereas Greninja continues to be a thoroughly underutilized and undocumented character.