My own annoyances about Garmanitan.
The gimmick with Darmanitan is that it's normally energized and angry, but it calms down when it enters Zen Mode (which is probably why they localized it as Zen Mode, even though Doll Mode would have been more accurate and wouldn't have made things weird eight years down the line). With Garmanitan, the temperments are reversed. It's normally calm and relaxed, but entering """Zen""" Mode has its dormant anger flare back up (decidedly not zen).
With Darmanitan, this is reflected in its mechanics. Its raging form is frail, pretty fast, and very physically strong, while its calm form is bulky, slow, and very specially strong. Additionally, its alternate ability to Zen Mode is Sheer Force, an unga bunga ability fitting for a Darmanitan that will be perpetually raging and not calm down at half health.
With Garmanitan... well, the raging form is good. Its stats are largely identical to Darmanitan's raging form, just exaggerated because it's now the doll form and the doll form has a higher BST. But instead of the calm form's stats being a milder version of Darmanitan's calm form, it's identical to Darmanitan's raging form. And instead of its alternate ability reflecting its state of calm, it's the most unga bunga ability in the entire game.
Zen Mode Darmanitan was a poorly-executed concept, but it an interesting concept, and the mechanical dichotomy between monkey and doll was something I think was worth preserving. While it would have made regular Garmanitan yet another slow bulky Ice-type, I'd take that over making it Monkey Dracovish for no discernible reason, and putting the bulky form first instead of second when it's already at half HP would have finally let Zen Mode function.