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Collect eggs at pokestops.
lv 100
The game is technically over but you can still collect Pokemon and go to more places.
you go to the Pokemon league and beat them and then collect the kanto badges
collect all the Pokemon in the national pokedex
level 100
level 101
Level 934, that's the highest they go.
You go around map. beat the gym leaders and collect pokemon. battle other people and level and evolve your pokemon.
Simply go to the musem (in Emerald,Ruby and Sapphire go to the Silph co bulding and talk to the scientist ((I forgot which one)) give him your fossil go out and in again and collect your Pokemon) in Ohrebourg city and talk to the guy at the counter give him your fossil go out and in again and collect your Pokemon.
free your most highest level Pokemon i usually get a dumb Pokemon i don't nee and then sacrifice
You go to the 7th gym in Snowpoint City. When you go to your map look for the city that is the furthest up and go there. The gym leader uses ice type pokemon.