I'm thinking the easiest thing to turn this into is a communication system, potentially with a longer operational range than the Warp Bands depending on how far out he can set up individual colonies of Beedrills to keep the message chain going. Within the range of the existing network, it would therefore likely only be useful as a backup system in case the towers ever go down or if the signal is disrupted, but if he can get enough Beedrills to operate over a long enough range, they could send and receive messages from farther away. The messages themselves would likely just end up being physical notes carried by the Pokemon, since I'm assuming the technology to translate back and forth from Pokemon speak to people speak is too advanced a thing to cobble together out of random old tech.