- For starters, Pikachu's control over his powers is currently erratic to begin with, although at his point in his canon he is beginning to have a better grip on them than before so he can actually utilize them to some degree. Pikachu in game would be able to do damage, though he could not use an attack like Flash that would be solely light based as the light would not manifest as anything more than perhaps a shadow. As for powering a machine, Pikachu could potentially be able to kickstarter a machine with electricity but anything more nuanced than that (i.e. consistent powering of a machine, particularly a complex machine) would be unlikely given his current control over his powers is erratic. So for example he could probably give a car with a dead battery a jolt to give it that bit of extra life to get started but he could not act in place of the car's battery for the car to run long term.

- I think it would be possible for Pikachu to potentially unlock his memories as Harry Goodman and I certainly think that journey would be a fascinating thing to explore in game. At the point from which he is taken Pikachu is already questioning the narrative that he was fed by Howard and hasn't had proper time to digest it so this will lead him further down the rabbit hole of trying to piece the mystery together. However, his loss of memory is from more than just simple amnesia so likely it would require some outside help to access the well of memories, and this I could see stemming from an event or potential character interactions. So yes, I would definitely love to play out that realization at some point if there is an organic means of having Pikachu come to that realization.