From the list of unaviable pokemon in gen8:

>In DP dex
Pidgeot family (swarm)
Ratatta family
Fearrow family
Paras family
Venomoth family (radar)
Mankey family (radar)
Bellsprout family
Geodude family
Doduo family /swarm)
Seel family
Grimer family (radar)
Hypno family (swarm)
Voltorb family (swarm)
Furret family (radar)
Ledyba family
Spinarak family
Mareep family (radar)
Hopip family (radar)
Aipom family
Sunflora family (radar)
Yanma family
Murkrow family
Misdreavus family
Unown family
Girafarig
Snubull family (swarm)
Slugma family
Houndoom family (radar)
Donphan family (swarm)
Stantler (radar)
Smeargle (radar)
Poochyena family (radar)
Wurmple family
Tailow family (radar)
Surskit family (swarm)
Breloom family
Slakoth family (swarm)
Makuhita family (swarm)
Nosepass family (swarm)
Skitty family (swarm)
Meditate family
Plusle/Minum
Volbeat/Illumise
Gulpin family
Numel family
Spoink family (swarm)
Spinda (swarm)
Cacnea family
Castform
Kecleon (radar)
Bannette family
Chimecho
Clamperl family
Luvdisc

>In Platinum dex
Gligar family
Tropius

>GBA Inmigration exclusive
Beedril family
Arbok family
Pineco family
Teddiursa family
Zangoose
Seviper

>Out of Sinnoh
Chikorita family
Cyndaquil family
Totodile family

Will they add the post gen4 pokemon?