Spinda has appeared today in Pokemon Go and the only way to get one for now is to spin a Pokestop that has a mission "Land 3 Curve ball throw in a row".
There are total of 8 patterns variation currently on Pokemon GO and each Pokestop would give you one pattern.
There could changes to get Shiny (had not been proven) which mean there will be in total 16 variation.
Here is the video of the first Spinda we got today.
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