All Coromon are monotype and there's a total of 7 different types (Normal, Ghost, Sand, Fire, Ice, Water and Electric). There are also Skill types along the main Coromon types, which are types for just "attacks" (that's why in the chart there's only 7 defending types while there are 13 attacking), and have their own effectiveness against the standard coromon types. This skill types are Magic, Foul, Heavy, Air, Poison and Cut.

I hope this is helpfull to someone, you can leave a comment if you have any sugestions so I can edit and improve the guide. If you want to help me, I have a curator page based on Monster Taming games, that you can follow. It would mean the world. I'll leave the link here in case anyone is interested: Tavern of Tamers