Although Pokemon of the Week topics are easy enough for anyone to chime in with, they can get rather stale. I like Xin ZhaoYun's suggestion to bring in the non-Pokemon aspects of Gen 5. There's a way to combine the two - Might I suggest running a tour through Unova? For example, start with Route 1 with discussing/comparing your favorites that are native to this area (Patrat line vs. Lillipup line) and also discuss one key event or feature (The multiple rivals or Shaking spots introduced in 5th gen). Route 2 could be Purrloin line vs. Audino and also discuss one key event (the topic not picked for route 1 or something like medals or something like the BW-BW2 route changes for these). Route 3 can be Pidove line vs Blitzle line and discussing the Pokemon daycare's early access in the BW games vs the daycare's late access in the sequels. Route 4 can be Sandile vs. Darumaka and about Join Avenue or Relic Castle, your choice. Route 5 introduces the champion and in the sequels introduces Hidden Grottos. Whenever we encounter a town, discuss the gym leader. There's plenty of charm that Unova has to offer. I largely forgot the specific game's routes/towns, but running through this generation again in a discussion format would be awesome. :D