From TheGamer: "Pokemon Go players can claim a free bundle every Monday in March, and the first one is available today.
Even though you can spend real-life money on Pokemon Go (and a lot of it) the app is free to download and you never have to spend any money on it at all if you don't want to. Niantic giving away free bundles can help you achieve that. Every Monday throughout March, Pokemon Go players can claim a free bundle. Since today is a Monday, and it's the first day of March, the first of those five free bundles is available now."