How many Santachus are enough?

I caught two but accidentally transferred one when trying to do appraisal. .

I must have caught at least 20 so far, transferred all except two and evolved the best one to Santa Raichu. I reckon they have little trading value as everyone would have one by now.

I caught eleven, evolved one.

Caught 7, kept 4
None are above 70%

They would probably only have any value for trading if they have perfect or extremely close to perfect IVs

I've caught about 10. Keep the one with a decent IV/CP combination and transfer the rest.

I remember the day when I heard about Pikachus with a santa hat on and I was excited when I found one.

I now have 25 in my bag and have transfered atleast 10 more.

Most have bad IV, but I get a couple over 82% and one of them have 584 CP.

Not sure how many I will keep, but probably as many as I can. And I will evolve the one with 584CP so I get a Raichu with a hat. Not sure if I will evolve more than one or if I'll save the candy to power up the two Raichus I've got. Got loads of star dust to spend, so I have to power up a few Pokemons soon.

Just 10. Pikachu was a rare find locally so I'm quite happy to have one or two more Raichu for prestiging. For the first couple I did try and find them when they popped up on the tracker. Now I'll only bother if they're very nearby.