Wow, I am totally shocked how little attention this podcast has gotten because it deserves so much more appreciation than iTunes gives it (its not even the first result if you search "silph radio"). Nathan is a fantastic host and his sheer enthusiasm and excitement adds to the entertaining value of this podcast. His guests are great. All knowledgeable about pokemon in their own way. Craig has general knowledge about the pokemon universe, Jeremy has in depth knowledge about a lot of stuff in and outside of pokemon and always has unique and interesting philosophical perspectives on any topic, and Brianna is energetic, hilarious, and a fan of the anime (I am too!). I only started listenting a few weeks ago and I am currently working my way through the back catalog, hopefully I can get caught up soon. This has quickly become one of my favorite podcasts, hands down.
I would love for you to do some episodes focusing on each region. You could talk about general information about the region, some unique facts, how it is different between the games, the manga, and the anime (like specific locations that aren't in the other mediums), the culture of the region and how that is influenced / influences the lore of the Legendary Pokemon from that region, etc... If you see this you should make the first region-focused episode on Sinnoh, because its got some really cool lore about the legendaries and its really diverse and cool geographically (its also my favorite).
Keep up the EXCELLENT work Nathan!!!