what is the hybridisation of Pt(NH3)6Cl4

6Pt has Ground state electronic config. as: [Xe] 4f14 5d9 6s1
In [Pt(NH3)6]Cl4 , Pt exists as Pt+4
thus the electronic config. becomes [Xe] 4f14 5d6

As we know that d6 config and presence of a ligand like NH3 the hybridisation is d2sp3 similar to [Co(NH3)6 ]3+ 
See the hybridisation diagram here:

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