Some do collect those, and there is a thread here for it (although it has gotten less attention for a long time).
I stopped checking after I had saved half a dozen and decided to heavily prioritize USEFUL mons, rather than RARE ones.
Here are the ones I saved. Just for kicks I maxed a Magnezone (to level 40, before max was raised to 50). It has been chosen several times by the game as a recommended attacker in raids, showing that low IV doesn’t render a mon totally useless…)
Hello @Piano1350
it’s my work to do this work of moving post to the right place.
I hope you can accept this move.
Apart of this, greetings to Zaragoza, I’m from Valencia, Spain.
These have been caught over the last 3 days.
Looking at my 0% collection I only have 2 Pokémon where I have enough for the full family line. One of those I Don’t have the full family of 100’s 
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No