I have mentioned before that each Gym Leader will have a challenge in order for the Pokemon trainers to reach them. Fox's challenge was easy because he's the first Gym Leader and beginnings are always supposed to be easy.

Now, what I have in mind for Mario's challenge involves items from the Mario games that are very iconic such as a Mushroom, a Fire Flower, a Superstar, etc. I'm still deciding on some of the items. I have been going for each one that are different colors such one that is green, one that is blue and one that is purple. I think it might be too difficult to do it that way since I can't really think of one item per color. Anyway, after the trainer finds all of these items, which are scattered all over Cerulean City, they are to bring it up to the Cerulean Gym where the path to Mario's Gym opens up. That's what I have in mind.

I will mention the other challenges when I decide to.