Adventure Squad
Adventure Squad, more than Gates to Infinity, is the true black sheep of the PMD series. Wiiware-only, never officially localized, extremely short and simplistic plot, and no human protagonist or partner character.
To be honest...I never actually played this one. I only watched it, and analyzed it.
It's a strange game. Rumble graphics, yet PMD gameplay. PMD themed, but with little of what makes PMD so great.
It would be completely fair to say it's the worst PMD game by far, and I would agree.
And yet...
Even it has echoes of what makes PMD amazing.
And it has some pretty neat concepts of its own, too!
For starters, completely changing the town setting based on what version you play? That's a really cool use of different versions! Arguably the best use of different versions in the series, I'd say!
And the music, while all of the dungeon themes are the exact same melody arranged in different ways, I love the town theme, and especially Slowking's theme.
Slowking's theme is one of my favorite pieces of music in all of PMD, to the point where I'm tempted to commission a remix of it just to get people to appreciate it more and for usage in my PMD fic Eternal Shadows.
And it still has that PMD charm. The Gastrodon shopkeeper duo are lovely, and Slowking genuinely has quite a bit of charm, too.
Adventure Squad is a weird, weird PMD game. But even it has parts that shine bright like its bretheren.
At the very least, I recommend listening to the two pieces of music I mentioned. They really are quite lovely.