what i did was train your team in mt. cornet or around snowpoint city because there is really good Pokemon around that area. hope this helps :)
The best place to train a lvl 20-30 Lucario is up by Snowpoint city. Fighting types like him are really good there.
At the ppl in the sea or 1 island
sky pillar the further to the top you get the stronger the Pokemon get. on the floor just under rayquaza u can find lvl 50 claydols. on the top is rayquaza lvl 70. its almost unstoppable at lvl 100
you should train sycher against fire and pshcik pokemon:D
well the best place to train is in the last part of the forest of death and to only fight the centipedes. if you fight three of them against your three people then you get 1800 xp a piece
The first time you fight him, Juan has: lvl 41 Luvdisc, lvl 41 Whiscash, lvl 43 Sealeo, lvl 43 Crawdaunt, and lvl 46 Kingdra. The Second time you fight him he has: lvl 46 poliwag, lvl 46 Whiscash, lvl 48 Walrein, lvl 48 Crawdaunt, and lvl 51 Kingdra. The Third Time You fight him he has: lvl 50 Poliwhirl, lvl 51 Whiscash, lvl 53 Walrein, lvl 53 Crawdaunt, and lvl 56 Kingdra. The fourth time you fight him he has: lvl 56 Lapras, lvl 58 Whiscash, lvl 56 Poliwhirl, lvl 58 Walrein, lvl 58 Crawdaunt, and lvl 61 Kingdra. The final time you fight him he has: lvl 61 Lapras, lvl 63 Whiscash, lvl 61 Politoed, lvl 63 Walrein, lvl 63 Crawdaunt, and lvl 66 Kingdra.
In the Stronghold of Security, fight the weaker Minotaurs with 10 hp, just shoot a bunch of them with low level spells.
you should fight about 1 lvl above your lvl you can fight anywere if you click the globe
jus keep fight then the higher lvl you get the more monsters you can fight then you fight lvl 3 goblins first the lvl 9 al-kharid's then lvl 15 unicorns the lvl 19 bears the lvl 42 hobgoblins the lvl 82 lesser daemons with food you will so die
elite 4 or victory road
where are you at right now? if you're done with bahumut, the pharos are the best place to lvl.
Probably white knights this is what i used to get to level 72.
you should get on a popular world and go to the duel arena and fight other people that are your level that is what i do i am a lvl 35 with 35 range so i would strongly advise this
Edgeville dungeon
henesys party quest till lvl 21 then go kerning party quest
Warriors Guild, same place where you get defender, on those giants.