I don't really have the time or motivation to do this at the moment, sorry. However it's a pretty simple animation and you shouldn't have much trouble adapting it to other sprites with just a basic understanding of how to edit image files. Overlay the preset sprites I provided on top of the HGSS boy's sprites or whatever else you want to have holding the watering can, then manually delete all parts of my sprite that aren't the watering can. You may need to make a few small changes to the sprites you're trying to apply this to depending on how it lines up, such as moving the hand positions.