I have a close one in Sapphire, which is my only game from this generation, and the 2 others still in their 70's.
Blaziken level 96
Kyogre level 73
Xatu level 72
My brother on the other hand, since he has Emerald, and he plays it so much, has a whole team, and also some from a game he bought secondhand from a secondhand store, which I may go back to so I can complete the GSC Pokedex in my Silver, by buying Gold.
Emerald:
Alakazam
Torkoal
Mighthyena
Swampert
Manetric
Skarmory
Others(secondhand game; list may be inaccurate):
Kyogre
Groudon
Rayquaza
Latias
Latios
Deoxys
Jirachi
Salamence
Blaziken
Swampert
Grovyle