Add Sword/Shield encounters (Part 4: Northern Wild Areas)

[jemarq04]

Change description

The continuation of PR #1550, #1564, #1577, addressing issue #1459. I've reviewed each of the location areas as I usually do for encounter PRs that I review formally to try and catch as many mistakes as possible. This will mark an end to the base-game encounters for Sword/Shield, and all that will remain are its DLCs.

This PR adds encounters for all needed conditions (weather and before/after beating the game) in the northern wild areas in Galar. Missing prose was added for each location area that gained encounters as well as all remaining location areas within Galar. This helped me find some extra location areas for locations that only have one, so those were removed and areas were renamed accordingly. The only new location area is giants-mirror-area-2, and giants-mirror-area was renamed to giants-mirror-main to be consistent.

Also, after checking Bulbapedia, I added a missing post-game condition to special wandering Pokemon in the wild areas at level 65 (which had been missing beforehand). Some missing level and percentage differences in southern wild areas were also caught and fixed.

For this, I also realized I had been using the overworld-special and overworld-water-special encounter methods for the wanderers in the game, as they weren't only-one (static) encounters but were special guaranteed encounters once per day. For consistency, I've edited the prose for these methods to be applicable for both LGPE and SWSH games. However, if we think it would be more descriptive, I can easily change the relevant SWSH encounters to new wanderer and wanderer-water methods with more descriptive prose. What do you think @Naramsim?
Edit: Actually, it seems that Bulbapedia considers these wanderer Pokemon as a new method for SWSH and SV: https://bulbapedia.bulbagarden.net/wiki/Wanderer. With that in mind, I made new methods for them and updated the encounter slots accordingly. Sorry I tend to go back-and-forth!

Next will be working on the DLC version split in the API.

AI coding assistance disclosure

No AI used.

Contributor check list

• I have written a description of the contribution and explained its motivation.
• I have written tests for my code changes (if applicable).
• I have read and understood the AI Assisted Contribution guidelines.
• I will own this change in production, and I am prepared to fix any bugs caused by my code change.