For Gamma use a army of r-gigas or R-reapers (just cause R variants have boosted stats)

For Beta tame the 3 titans and fight it along with any left over creatures from the gamma fight

For Alpha use any left over creatures from the previous two fights (including titans) and a mega-mek using the module obtained from the beta fight (I would suggest combining ascendant meks for the mega-mek so that it's stronger) hope this helped

More King Titan Encountering Tips