Lately, the issue of who will fill the Fire slot on Ash's team has been a hot topic. Some suggested Numel, but the Numel ep passed without a capture. Some suggested Torkoal, but Flannery has one...although there's a Torkoal ep coming up, so who knows? And Torchic is already taken, so that's all the R/S Fire types. So other people have suggested that Ash won't get a Fire type at all, but a Poke that is good with Fire attacks....which leads me to this theory:

In the games, when you save the Weather Institute from Team Aqua/Magma, you get a Castform as a reward, and the guy who gives it to you says that they have lots so it's ok to take it. As we know, Castform can change the weather, and change its type to correspond, which would include using Sunny Day to become a Fire type, and being able to use a Fire-type Weather Ball. Do you think that that scenario from the games will also happen in the anime? Maybe they'll have lots of Castform, and Ash will save them from being stolen by one of the Teams, and the Weather Institute people will give him one as a reward.

What do you think?