Clean-up Pokedex data for old gens

- For Gen 2 and 3, Pokedex was filled with redundant data. Gen 4 was about the same, except for Rotom formes.
- Remove references to baby prevolutions in gens where they don't exist.
- Fix a bug preventing Magmar below level 30 from being used in Gen 1.
- Apply 4179070 and a39fdd6 to Gen 1.