"Anyone else seriously lacking Sinnoh Stones?"

#PokemonGO: I recently (in the last 3 weeks) have started trying to do 3 trainer battles a day plus one team leader battle each day, trying to get some Sinnoh stones. Usually, the people I battle against are awarded a Sinnoh Stone but not me. At first I figured it’s just RNG, whatever. But its now been at least 3 weeks and I have not received a single one. None from battles, none from research breakthroughs or any other source (if there are any?).Is there any reason this would happen? Am I just insanely unlucky? I’m trying to get some for community day coming up, and now the new evolutions too (like Lickilicky), but I just can’t get any... And am irrationally annoyed that ALL gen 4 evos need the stone that I can’t get. via /r/pokemongo http://bit.ly/2RYHYlA