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Get any capsule monster up to level 4
This is how you can get any capsule monster up to level 4, one of the cheapest ways:
You should already be able to go to Forfeit Island. When you get there, keep buying 99 vice pliers and feed them to your capsule monsters--don't worry, there's no wasting anything when you start fresh. On level one, the vice pliers should feed them four marks, all the way to the end, evenly (no extra/wasted energy). On level two, it should raise them up two marks, and on level three, it should raise them up one mark for each vice plier. This is very cost effective--each vice plier is only 6000 coins! (Lion Fangs are too expensive for what they have to offer.) For money (about 60,000 coins each battle), I suggest going to the crescent-shaped island in the middle of the ocean (south of the triangle-shaped islands) to fight the very difficult monsters there. You can also get Darby, the Dark Capsule Monster, in a tree there.
If you are very ambitious, and want to bring your capsule monsters up to Master Levels, do this: first, get a monster up to level 4 (Foomy H, Blaze Dragon, Twinkle, Green Titan, Stone Head, Big Imp, or Blue Titan). Next, feed each capsule monster one fruit of a capsule monster of the opposite element. However, you must do this at a given level, not just level four.
To get each capsule monster up to level M, feed them the following at the given level.
JELZE- level 4- Secret Fruit
SULLY- level 4- Breeze Fruit
GUSTO- level 4- Earth Fruit
BLAZE- level 3- Charm Fruit
ZEPPY- level 3- Flame Fruit
FLASH- level 2- Dark Fruit
DARBY- level 2- Holy Fruit.
When a capsule monster is at level M, you can only use the level M monster, not any of the other level monsters. For example, when Blaze is at level M, you can no longer use level 4, 3, 2, or 1--Armor Dog. However, if you want to get the "standard" capsule monster back, just feed the monster its standard type of fruit (ex.- Blaze gets Flame Fruit, Sully gets Earth Fruit).