if you have wizardmon, you know you can't move forward without data core , and that is this. so it's like part of the story.
first let's talk about etemon's mic. this is definetely quest mission when you have etemon in the farm . the location is in the 4th room from the first gate . you would meet with prince mamemon and you have to answer, see my answer which is the right one but i don't think there's wrong answer
the chrome digizoid mission only works if you have this apemon in your farm. the first thing you do is get the item in the chrome mine. the location is in the empty room and there's purple box in there too.
once you get give it back to your apemon, and he ask you to deliver this to dinohumon in teh sheer valley. at the 2nd 2 ways , go to the bottom place not the upper place, if you go to the upper place you want to meet with pandamon, that's dinohumon location
about the data core, you have to enter chrome mine and go to the deepest part of it, you would meet with kain and tomomi
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