>>31014819I feel like "Northern Europe" might be too broad, especially with the wide scope you're giving it. You've got Celtic, Norse, Inuit, East Slavic, West Slavic, and German/Pagan culture all going on at once.
It seems like you intend on altering the geography pretty heavily, so I can't really give an opinion on the mapping until there's at least a draft, but I'd say you might want to do something like have Scandinavia be the primary focus/core of the region, with the other Baltic cultures like Russia and Germany maybe just having a devoted themed area around the edges of the map. Britain and Ireland would make an excellent post-game area, if not a full-blown second region entirely. With the huge potential that you could get from Celtic and English/Arthurian mythology though I'd say incorporate them into the mainland/main story path.
>Any suggestions for base ideas for Pokemon?You could make a dozen Legendary Pokémon from the Norse Pantheon alone. Plenty of material for regulars too, like Ice Giants and Valkyries.
A sword-in-the-stone Pokémon. But it'd be hard to differentiate it from Aegislash.
A Pokémon based on Cú Chulainn. Probably would work best starting out as an actual hound/wolf, then evolving into a humanoid. Gaé Bolg could be incorporated as a stick it carries in its mouth as a dog, which evolves into a spear when it becomes humanoid, and gains a signature move to use it.