I know this is impossible, but I would much prefer having the number of ways to evolve simplified and reduced to only a few, so forget making new.
But again, this will never happen, because they never seem to correct older ways, and instead introduce new ways.
I'm sure Eevee would have evolved into Leafeon using Leaf Stone, but they made the new way just so that people can't say "Why didn't it evolve before when I tried?"
So yeah, if things could be simplified, I would like only these methods:
1. Evolution by leveling up.
2. Evolution using items/stones.
3. Evolution from happiness.
4. Evolution by gender.
5. Evolution by holding an item and leveling up.
I want evolutions to be changed in these ways so that only these five methods are needed:
1. Politoed to evolve by holding King's Rock and leveling up one level instead.
2. Kadabra, Machoke, Haunter, and Graveler to evolve by leveling up instead.
3. I don't even want Magnezone to exist, but if it did I want it to evolve using Thunderstone.
4. Steelix and Scizor to evolve by holding the Metal Coat and leveling up one level.
5. Tyrouge to evolve using three specific items instead of stats.
6. all evolutions needing certain moves to be changed to just normal level up evolution.
7. Kingdra to evolve by holding Dragon Scale and leveling up one level.
8. All baby Pokemon to evolve through happiness and leveling up one level.
9. Leafeon and Glaceon to evolve using Leaf Stone and Dawn Stone instead.
10. The Porygon family to evolve by using the discs.
11. Gliscor and Weavile to evolve by leveling up holding their respective items.