>>724859312 (OP)
Performance-wise, Meganium clears them both out the water. Feraligatr needs a good ability to stand out because it's stretched a little too thin between offense and defense, and Emboar have no real advantage in just using his normal form + Life Orb. Meganium gaining Fairy type and boosting its huge bulk means it is a genuine wall and will be terrifying once it gets an ability, especially if its Flower Veil, Triage, or even Chlorophyll.
Design-wise, yeah, Feraligatr. Emboar's not BAAD, but you do feel like without the flame lance and top-knot, it looks just like normal Emboar. And...nah, the flower turtleneck is...not it, brother. Goofy as the idea as becoming its own mascot, Feraligatr pull it off pretty well and a good showcase of their upgraded animation tech.
Shame that the 4-arms idea seems to have been cut (or not real?). I think that would have really sold me on the look
>>724866331
>Mega Garchomp
Fuck no. It and Aerodactyl are two of the WORSE examples of the first wave of Mega designs. Unnecessary spikes that makes for an incomprehensible silhouette and doesn't even look practical for killing or looking cool. It's what Little Timmy thinks a Pokemon evolution should be.