Great option: Kyogre
Decent option: Lugia
Situational option: Latios
Ultra situational option: Hooh.
Dont mind about timing out on Machamp. It happens if you dont have a good team, but if you will get regular mewtwos then as soon as you get a >91% and power him up, Machamp will be easy as balls.
If you need to solo Machamp now, then go ahead and power up Lugia. Its still the tankier generalist option in PoGO right now.