This... Most of you have done this stuff, but lets get started.

For early Game: Make sure you Try to pick out which RM looks the easiest, And try to see if you can get everything done with Neutral Moves. If you fail, It's fine, Because you unlock Roll/Disco/Rhythm. Roll Unlock: Fail 1 Mission in MM1/Light. Disco: Fail 2 missions in MM2/Wily rhythm: Fail 3 missions in Cossack.
Anyway, If you can't beat them With the Buster shot, it's alright. By the time you get to the "Rival Battles" You should be able to Have a few bot's with you (Reccomended to use your strongest)... Then, Go on, You'll need to grind For the journey ahead. "There are a few levels ahead, You need to get a Couple of hundred of them", Anyway... You should try grinding with Rival battles for a while, Or go to intro field, and beat mets, and unlock... Mecha support!/Field support!. But After grinding, Get the rest of the bots, Go and finish those stories, then you know.

Late Game/Side: After all 3 Stories, it's time for the Big goals, This IS coming from Number 10, you know. Anyway, Your things you should be doing is first: PLAYER BATTLES! Player Battles you can unlock any time with Chapter Get: Player Battles! In the code thing, (Go to Mechanics in Locked then go to Password Prompts for the 3 things... Also, Shadow blade and Bubble Bomb are from The code's too, But shadow blade you know, Bubble Bomb is required for one small goal)... Then, Go and do PB (PLAYER BATTLES) For a while. PB is the best way to get BP(Battle points), And your gonna need BP if you want to get to ANYWHERE, after getting to the top 50, Or 100, Let alone top 30/25/20/15/10. Next: LEVEL 100. Your gonna want/Need to get your robots to lvl 100. Got to bonus field With high Multiplier of Water/Time/Flame. Then For the first 2, Spam that move with No other water character. Every character may get 9999 EXP which can be 9/10 Levels Per Bot. Next: Starforce. Starforce is another requirement for the TOP TOP TOP Of the leaderboard. More later.