There's a difference between simply throwing a license around and actually having Nintendo or GameFreak develop a game. And there's also a difference between a full-fledged game and an interactive play thing.
All the PC (or Mac) Pokemon games simply used the license. Nintendo or GameFreak did not develop these games. They were made by Mattel, TLC, and ValuSoft. Not really big name game makers. Wizards of the Coast developed some CD-based TCGs, but that's about it.
Mario Teaches Typing was from Interplay and Brainstorm. Again, no Nintendo involvement other than the license, and they weren't games persay - just interactive play things.
Way back in the days of NES, Nintendo had a slight interest in bringing Mario platformers to the PC market. Several developers were approached, but eventually Nintentdo decided that it wasn't a good idea and they rejected the entire project.