I didn't play the game much after defeating the Elite 4 but I'll post whatever I have done.Since I needed to get 60 Pokemon registered as caught,I went catching Pokemon.I caught many basic Stage Pokemon and evolved a few which required little levelling i.e. Butterfree and Beedrill and Stone evolutions like Clefable and Ninetales.After getting 60 Pokemon registered,I went to Prof.Oak who upgraded mine and Red's Pokedex.I went to One Island and visited Mt.Ember.I defeated the two Team Rocket Grunts and overheard one of the passwords:Goldeen.Inside there,I found the Ruby which Celio needed.I returned it to Celio who gave me Rainbow Pass which allows entry to the other four of the Sevii Islands.I went to Three Island and found that the Three Isle Path had been dug up.The man who dug it up gave me a Nugget.I saved the game.
Charizard Lv.53 Male Timid (Flamethrower/Fly/Earthquake/Dragon Claw) Ability:Blaze Held Item:Charcoal
Primeape Lv.52 Male Jolly (Cross Chop/Karate Chop/Seismic Toss/Rock Slide) Ability:Vital Spirit Held Item:Black Belt
Victreebel Lv.52 Male Sassy (Giga Drain/Acid/Stun Spore/Sleep Powder) Ability:Chlorophyll Held Item:Leftovers
Jolteon Lv.54 Male Modest (Thunderbolt/Hidden Power Ice/Bite/Thunder Wave) Ability:Volt Absorb Held Item:Leftovers
Starmie Lv.53 Genderless Quirky (Surf/Psychic/Ice Beam/Thunderbolt) Ability:Illuminate Held Item:Mystic Water
Rhydon Lv.52 Male Timid (Rock Blast/Strength/Double Edge/Take Down) Ability:Lightningrod Held Item:Quick Claw