Tyranitar and Charizard should be doable. The first one has been done but there probably isn't enough interest for the second one for an attempt. Given Moltres has been done with 2 people and Charizard has lower stats all around with a similar (or easier) scaling, it should be possible by extension.
EDIT: Sorry Charizard probably can't be done, I was using Moltres as a reference but forgot about the 2 minutes less on a non-legendary raid.
However, no Tier 4 raids can be done with 2 Mid level 30 players as far as I know. For Tyranitar, needs at least a Level 35 with Maxed machamps with 15 Attack to hit the breakpoint at Level 36.5, and no Level 35 has that kind of resources, so realistically we are talking about Level 37+ here.