That probably had nothing to do with the event and was just a random lucky spawn. I doubt the Kanto event is boosting any from Hoenn.
Well... Before the event Solrock/Lunatone spawns were non-existent everywhere in my city and suddenly I found a few Solrock in the span of ~30 minutes. Now either they suddenly and randomly decided to spawn during an event that would cause them to actually spawn less, or their spawns are boosted a bit.
On another note-- Since the event started I've made tons of progress actually. Finally hit level 30! Registered Charmeleon, Charizard, Clefable, and Electrode from the Kanto dex so far leaving me with just Blastoise, Kangaskhan, Mr. Mime, Articuno, Zapdos, and Mew left to get.(Damn Regionals and time-locks...)
Along with those I've also registered Scizor, Pupitar, Tyranitar, Grovyle, Sceptile, Kirlia, Gardevoir, Solrock, and Milotic. The evolutions were mostly because of boosted candies from eggs/buddies. Scizor I only needed 9 candies to get and the first Pokemon I found during the event was a Scyther, so I quickly got him evolved. I needed 24 candies to get Tyranitar and ~30-40 candies to get Milotic and I was very lucky and got a Feebas and Larvitar from eggs. The Feebas gave me 51 candies and the Larvitar gave me 42 candies. I also did a Golem raid and got 8 rare candies and I needed 4 candies to get Gardevoir, so I trashed a Ralts and put two rare candies into them and evolved my best one, then I put the other 6 into my Treecko, leaving me with 3 more candies needed to get Sceptile, so after I got two candies from walking I evolved my Treecko into Grovyle to get the extra two candies and then evolved it into Sceptile shortly after.
Also thanks to the event I evolved a Magikarp for the special research(I can already evolve ANOTHER! Waiting to see if I get a shiny from the event.) and I've also gotten much better IV/CP catches for Seaking, Dodrio, Gengar, Alakazam, Beedrill, Arbok, Raichu, Slowking, Jynx, and Tauros. Finding a lot of Bellsprout and Poliwag, so I'm hoping to snag some good ones there. I still need Politoed, I have the King's Rock for it, but I'm holding out for a really good Poliwag to evolve.
Hoping to hit up an Aerodactyl raid during the event. My current one is only 943 CP with 35% IVs... sooo... I really need a new one.
Also found a Vibrava and a Beldum today, which was really shocking because of the spawns. Before the event started I found a few Anorith and Mudkip which is very, very rare here. I can almost get Swampert, just need 4 candies. Gonna buddy him up for 5km and then evolve it up to Swampert, then I'll swap over to Anorith to get a lot of candies for him.
Also slightly disappointed Moltres is the research breakthrough again... Was hoping to have a Regional or one of the other Legendary birds be available through it. Hopefully they'll cycle it out like they do with Raids, or else it'll get
really stale
really quick.