XD.
I did Mt. Battle three times to get the Generation II starters, and that got me to Lv. 98 from whatever level you get Lugia at, with use of the Lucky Egg though.
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last time on D/P
Kyogre lvl 81
Dusclops lvl 40 (trained during elite 4)
Rayquaza lvl 72
Zapdos lvl 54
Heatran lvl 70
Swampert lvl 90
:P
i owned with one pokemon
he started off at lvl 65 now 71 :P
aerodactyl
with
wing attack crunch hyper beam take down :P
i only needed to use 4 full restores on him xD
Earlier on Diamond
Swampert lvl 94 (100 soon :D)
Infernape lvl 59
Staraptor lvl 52
Glalie lvl 52
Garchomp lvl 48 (evolved during)
Rhyperior lvl 56
vapoureon
flareon
jolteon
espeon
umbreon
Glaceon
all lvl 100 :D
Just did it yesterday in Emerald to level up my Wailmer to get Wailord so I could catch all the Regis
lvl 71 Rayquaza
lvl 70 Groudon
lvl 70 Kyogre
lvl 63 Mew
lvl 37 Wailord
I had one more but forgot what it was.
Ruby
Hall of Fame No. 53
Groudon - Lv. 100
Latios - Lv. 100
Lugia - Lv. 100
Sceptile - Lv. 100
Nuzleaf - Lv. 43
Voltorb - Lv. 47
Fire Red
Hall of Fame No. 6
Zapdos - Lv. 72
Moltres - Lv. 70
Charizard - Lv. 74
Articuno - Lv. 71
Snorlax - Lv. 32
Lapras - Lv. 36
gonna have a crack at getting the trio birdies before attempting the elite four. OMG the fire bird (cant remember name argh) is so annoying to catch. 1 health left, paralyzed and a lvl 51 throwing an ultra ball and it still wont stay in.
its moltres :)
and put it to sleep if you can :D