This gift will be distributed via Local Wireless at the league location, from Feb 16 to Feb 17, 2019.
Ultra Sun receives Thundurus, Ultra Moon receives Tornadus.
It's interesting to note that Tornadus will get the special move Heat Wave, normally not accessible by it. (it's a USUM tutor move)
source: https://pokemonkorea.co.kr/pkl2019_s2