After discovering my devastating loss of Silver, I checked to see if my Crystal version was still working. I discovered a completed game file from a couple years earlier was still there, and moved back its matching ID# Pokémon which I had transferred onto Stadium 2. Quilava, Espeon and Forretress all between L50 & L60 were the ones I had gone through the game with. As you can see, things have progressed a fair bit since then. I make sure to keep them backed up with means I wish I'd had then.
Quilava Level 100
Espeon Level 100
Misdreavus Level 100
Forretress Level 100
Corsola Level 100
Xatu Level 100
Ampharos Level 100
Houndour Level 100
Crobat Level 100
Smoochum Level 100
Tyranitar Level 100
Heracross Level 100
Celebi Level 100
Lugia Level 60
Queendra Level 50
Steelix Level 50
Porygon2 Level 50
Meganium Level 50
Notes:
- Asterisks denote Pokémon raised all the way to level 100 on other versions before being traded over, thus avoiding boosted experience.