How do I use Rainbowmons effectively?

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Rainbowmons are awarded to me randomly, and currently the only thing I really know what to do with them is to train my other monsters with them.
Is there something else I should be doing with these guys?
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How do you use Rainbowmons?
Rainbowmon are only used as level material to help evolve other monsters, and cannot participate in battle. To use, sacrifice the Rainbowmon to another monster during the evolution process. Rainbowmon are born at max level, and can be evolved immediately upon arrival.How do you get a 5 star Rainbowmon?
The guild shop is quite simple. Once a week you can buy a 5-star Rainbowmon for 150 guild points. The guild shop will reset every week on Monday at 12:00am server time. So make sure you get this.How do I get more Rainbowmon?
As for Rainbowmon, you tend to get a lot if you farm Rift or Cairos dungeon a lot, often as 3-star max. If you have lots of junk 3-stars, you can use them to craft Rainbowmon to save time, but it is quite expensive to do this, so only do it if you're in a rush or you have a lot of surplus 3-stars sitting in storage.Where can I get a 4 star Max Rainbowmon?
How do you get a 4 star Rainbowmon? The efficient way is to just pop up 1 day booster then level up mobs with friends rep. Also with combination of buying weekly 4* max RB and 3* max RB drops is the best way.SUMMONERS WAR : Beginners Guide to Rainbowmon Angelmon and Devilmon
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Andrea Piacquadio, Ivan Samkov, Andrea Piacquadio, Andrea Piacquadio