How lovely were the aliens

[Wisemon]

Glad you've done it. But now I need your help
My prosperity rate is 95 (not 97 as I thought)

Since you helped me, I'll be glad to help you.

Taking a Digimon, who loves hot places, to a cold place is against the rules, but....

That's Frigimon. When a Digimon like any In-Training, Agumon, Greymon, Tyrannomon, Centarumon, Monochromon, Meramon, goes to Freezeland, his happiness suddenly gets weird and he's supposed to get sick. Then Frigimon will save this Digimon. I tried that several times, and it didn't work, so here's how I got around it. I intentionally got one of those Digimon sick (injection icon, not bandage) using either a Lucky Mushroom or too many Digi-Sea Bass. Then I immediately asked Birdramon to take me to Freezeland. Frigimon will lecture you. Then come back to his igloo with a Digimon that doesn't dislike the cold, and he'll join the city selling ice cream in the restaurant.

In an Iron City to the west a rare Digimon may appear and challenge others to fight.

This is MetalMamemon, and he was the hardest one to get. On the second screen in Factorial town, the road shaped like a backwards L, he appears. I had to keep popping in and out of the screen for several days, and I think he finally showed sometime at night or sunset, which works out nicely for your Digimon. Once you get him, he'll appear occasionally in Penguinmon's rink. He's harder to beat, but he gives a better prize.

I still have to get to the World Tournament in DW3 RPG

Yeah, I can't figure that out either. I know you can't get to it after you beat the game, because it just resets, but I've tried at every spot before beating it to enter too. I don't know what the requirements are, and I'm just assuming that there is no tournament.