So assuming no other surprises like Magearna added between now & then, these are the final missing Pokemon
Gen 1: Weedle, Kakuna, Beedrill, Pidgey, Pidgeotto, Pidgeot, Rattata, Raticate, Spearow, Fearow, Ekans, Arbok, Paras, Parasect, Venonat, Vanomoth, Mankey, Primeape, Bellsprout, Weepinbell, Victreebel, Geodude, Graveler, Golem, Doduo, Dodrio, Seel, Dewgong, Grimer, Muk, Drowzee, Hypno, Voltorb, Electrode
Gen 2: Chikorita, Bayleef, Meganium, Cyndaquil, Quilava, Typhlosion, Totodile, Croconaw, Feraligatr, Sentret, Furret, Ledyba, Ledian, Spinarak, Ariados, Mareep, Flaaffy, Ampharos, Hoppip, Skiploom, Jumpluff, Aipom, Sunkern, Sunflora, Yanma, Murkrow, Misdreavus, Unown, Girafarig, Pineco, Forretress, Gligar, Snubbull, Granbull, Teddiursa, Ursaring, Slugma, Magcargo, Houndour, Houndoom, Phanpy, Donphan, Stantler, Smeargle
Gen 3: Poochyena, Mightyena, Wurmple, Silcoon, Beautifly, Cascoon, Dustox,Taillow, Swellow, Surskit, Masquerain, Shroomish, Breeloom, Slakoth, Vigoroth, Slaking, Makuhita, Hariyama, Nosepass, Skitty, Delcatty, Meditite, Medicham, Plusle, Minun, Volbeat, Illumise, Gulpin, Swalot, Numel, Camerupt, Spoink, Grumpig, Spinda, Cacnea, Cacturne, Zangoose, Seviper, Castform, Kecleon, Shuppet, Banette, Tropius, Chimecho, Clamperl, Huntail, Gorebyss, Luvdisc, Deoxys
Gen 4: Turtwig, Grotle, Torterra, Chimchar, Monferno, Infernape, Piplup, Prinplup, Empoleon, Starly, Staravia, Staraptor, Bidoof, Bibarel, Kricketot, Kricketune, Cranidos, Rampardos, Sheildon, Bastiodon, Burmy, Wormadam, Mothim, Pachirisu, Buizel, Floatzel, Ambipom, Mismagius, Honchkrow, Chingling, Chatot, Carnivine, Finneon, Lumineon, Yanmega, Gliscor, Probopass, Phione, Manaphy, Darkrai, Shaymin, Arceus
Gen 5: Snivy, Servine, Serperior, Tepig, Pignite, Emboar, Oshawott, Dewott, Samurott, Patrat, Watchog, Pansage, Simisage, Pansear, Simisear, Panpour, Simipour, Blitzle, Zebstrika, Sewaddle, Swadloon, Leavanny, Ducklett, Swanna, Deerling, Sawsbuck, Tynamo, Eelektrik, Eelektross, Meloetta
Gen 6: Chespin, Quilladin, Chesnaught, Fennekin, Braixen, Delphox, Froakie, Frogadier, Greninja, Scatterbug, Spewpa, Vivillon, Litleo, Pyroar, Flabebe, Floette, Florges, Skiddo, Gogoat, Furfrou, Hoopa
Gen 7: Pikipek, Trumbeak, Toucannon, Yungoos, Gumshoos, Crabrawler, Crabominable, Oricorio, Minor, Komala, Bruxish
So Gen 3 is probably the most eyecatching at first blush, having the most Pokemon missing. But honestly my eyes drift towards Gen 2 the most. For how small that generation is, that's a surprising number of Pokemon missing. Also maybe worth at least one :think: emoji at how the gen 2 & 3 starters were the only other starters to get Home TM/TR lists updated, but gen 2's starters are seemingly absent.
But honestly it probably means nothing. WIth this many Pokemon still missing it's easy to grab all kinds of patterns and run with them to what they could mean. Our brains are too hardwired to find patterns!