There are many robot types, and the same number of cores. One problem stands... who can you get what from?

Well... That problem stands... until now! Ladies and gentlemen, the Guide to Cores!

First thing's first... How do you get them?
Well, it's simple: Demolish the opposing robot! Use weaknesses if you must!

Now, here's a list of cores that you can't have yet.

Laser
Shield

Not too terribly long. Here's the list of cores you can get... and who to get them from.

Neutral Roll, Rhythm, Disco, Enker, Punk, and Ballade.
Copy Mega Man, Bass, and Proto Man.
Crystal Gemini Man, Crystal Man, and Jewel Man.
Cutter Cut Man, Metal Man, Needle Man, Ring Man, and Yamato Man.
Earth Oil Man, Drill Man, Stone Man, and Concrete Man.
Electric Elec Man, Spark Man, Gravity Man, and Plug Man.
Explode Bomb Man, Crash Man, and Napalm Man.
Flame Fire Man, Heat Man, Pharaoh Man, Flame Man, and Turbo Man.
Freeze Ice Man and Blizzard Man.
Impact Guts Man and Hard Man.
Missile Magnet Man and Dive Man.
Nature Wood Man, Snake Man, and Hornet Man.
Shadow Shadow Man and Skull Man.
Space Star Man.
Swift Quick Man, Top Man, and Charge Man.
Time Time Man, Flash Man, and Bright Man.
Water Bubble Man, Toad Man, and Wave Man.
Wind Air Man, Dust Man, and Wind Man.

There we go, the core list. If I missed any other core drops, or if you want me to include the robots that are unreleased, inform me. Thank you.