
Originally Posted by
Dragonfree
Well, naturally you don't want to make the fact the Charizard knows Blast Burn come up for the first time when it suddenly saves the main character during the climax of the story, but having it used or simply mentioned at some earlier, less important point does the job just as well as inserting a scene wherein they train to teach it Blast Burn. If the moment it learns Blast Burn really isn't actually an interesting moment for the plot or characters (which it might be, of course), it's probably better left out.
I tend to actually like scenes that just involve fun character interaction or show interesting characters generally doing something interestingly different from what we've seen them doing before, even if they definitely could be cut without leaving a discernible hole behind, so I'd only personally complain if the scene is simply grossly uninteresting or if the ratio of such scenes to stuff that matters were truly obscene. (Which happens, mind you: if you insert a training scene every time your Pokémon learn moves and there's nothing to make any of them interestingly different from the last, or include dozens of trivial battles that just amount to a sequence of move descriptions, it's simply boring.) But if you're at any point thinking, "Oh, do I have to include this scene of battling/training/etc.?", you almost definitely don't, and the fact you're even thinking about it in those terms generally means it wouldn't be interesting. There is no type of general trainer fic event X where any scene that includes X must be in the story. It's easy when you're starting out to think certain things have to be in there as a matter of holy principle, regardless of whether they would in fact serve any purpose for this particular story, but ultimately that's not the case.