ofc they won't waste money and train at training island.. >.> the highest lvl mobs there just 150? or lower.. need to go there and check.. while you won't get any exp after ur lvl is 20 higher than the mob that u fight...

the only way to lvl up just by capsule (and 1% caps is not longer add 1% at that time...) or buy e remote and debuff/buff and let ur pet or lower lvl alt kill the mob