Some similar strategies to what help said, Astro Crush on an Impact or Space Robot with a Reverse Module (raises attack rather than decreasing) Dynamo Bolt with Buster Module to instantly fire off the bolt and of course, Rain Flush with any water core robot I highly recommend Final Destination III with Wily as the player for extra damage, using Dynamo Bolt to fry all the robot masters, giving 2500+ exp per robot master, depending on how many you have brought. I also recommend bringing 1 extra robot at a time, because that'll give about 40 levels to the robot that you are training. You can also change the robots that are in Final Destination III by changing the player fields on the Players tab found next to the Robots tab. The robots that appear correspond to their respective field. To further expedite training, I recommend changing the Preserved forest (Wood Man) and five other fields that isn't the Waterfall Institute (Bubble Man) to Arctic Jungle (Ice Man) , Serpent Column (Snake Man), Clock Citadel (Clock Man),Submerged Armory (Dive Man) and Magnetic Generator (Magnet Man). This will make Dynamo Bolt even more lethal, along with getting more of those sweet field experience bonuses. If you plan on using Astro Crush, change Abandoned Laboratory (Quick Man) and three other fields that aren't Sky Ridge (Air Man) to Abandoned Warehouse (Cut Man), Spinning Greenhouse (Top Man), Rusty Scrapheap (Dust Man), and Rocky Plateau (Hard Man). This will make Astro Crush even more lethal while raising the field experience bonus. For Rain Flush, there really isn't much, use Atomic Mill (Heat Man) and change Waterfall Institute (Bubble Man) to Lightning Control (Bright Man), and change Preserved forest (Wood Man) to something else that also isn't going to resist water, such as Toad Man or Spark Man.