Aradia: A high quality archaeology apron and some tools, along with some stylish, subtly Whimsicott-themed earmuffs because while he couldn't buy any of the really tacky stuff without hating himself he thought Aradia would probably like it anyway.
Twilight Sparkle: Some fancily bound editions of classic novels... at least, he suspects they're classics based on the fact that they seemed to resemble some works he's familiar with. They resemble Frankenstein, Goethe's Faust, and Pride and Prejudice (one of these things is not like the others one of these things does not belong) in plot and structure but are pretty different because hahaha it's Pokemon.
Captain Ash: A Silk Scarf. ...for his Pokemon, obviously, not for him, but if he's really that dedicated to the Normal types thing...
Ryner: A miniature Ho-oh statue in a traditionalish style.
Sion: A miniature Lugia statue in a traditionalish style.
Dist: A book containing some information on a building located on Cinnabar Island before the eruption, with various theories about Cinnabar Mansion. Some are pretty crazy, but some have tidbits of information that seem to be about some kind of failed experiment...
Carmen: A two for one deal! She gets a nice, subtle winter landscape, as well.

...also because he felt like doing something artsy, all of the above will receive a nice little box of homemade chocolates with various designs based around Pokemon types. These will be going to Ilya as a goodwill offering, Faize because he made a good first impression, and Dante and Dave Strider as a sort of belated "I didn't actually need the help during the weird nightmare shit because I have an overinflated opinion of myself but thanks anyway" present.