Ming-Ming and Kazuki are both pretty capable people. In the Mingster's case she'll more than likely find herself with a whole bunch of animal companions, while K would spend his time trying to eventually find a vessel to get himself off the island.

Jin's actually really comfortable surviving out in the wilderness, from finding food to even some making potions from wild plants. 100 days is no small task but I think she could do it.

Id like to think Mariah could survive using her knowledge of nature thanks to all the prep she did before starting her pkmn journey ;3;

Andre is more likely to last bc he probably had some intense survival training with the agency

I wanna say Estella would die, but she somehow survived being Multiverse of Madness'd through Ultra Space for a lengthy period of time so...

If this is in a situation where, either out of sportsmanship or disability, Odd can't tap into his powers, Odd would manage decently, having picked up a fair bit of camping/survival skills from his dad and friends.

Otherwise, he'd either just warp back home or stop by civilization every now and then to pick up groceries before going back to the island for an extended vacation.

Tyler is a bit tech savvy, so he might struggle for a few days, but Tyler will soon adapt to the island and would definitely thrive in it, thanks to him already being accustomed to surviving in the Wilderness

All you need is a water type and grass type for unlimited food and drink plus leaf/wood shelter.