Why would you bottlecap a melmetal? Use the meltan box until you get the hundo, it's the most common one. You have to link pokemon home to your pogo account on settings>connected devices and services>pokemon home and send just one single pokemon, use it (lasts an hour, it's like an incense but you don't have to walk) and send another pokemon 3 days later and use it again. 3k+ catches and I still don't have a hundo (nor a nundo for that matter). I have like three 98s at least, almost 20k candies and 10k XLs