>Crystal
+ legit Celebi, you can even shiny hunt it
+ some dungeons are more detailed compared to Gold/Silver, a reverse of how Yellow simplified them compared to Red/Blue/Green
+ easier Headbutt trees, no more guessing where to get your Heracross
- no Mareep, you're stuck with Magnemite/Chinchou
- Suicune is just 'gifted' to you, no more hunting it down
- Lugia and Ho-oh are both overleveled and don't have their signature moves, there's no Move Relearner in this era
- other Gold/Silver Gen 2 Pokemon are missing because fuck you
- swarms are much harder to get since trainers will call you for mostly useless bullshit (they were shilling a GB phone service during this era)
- evolutionary stones are also much harder to get as a result
