I'm excited to play more of this game, it's beautiful! Therefore, I'd be happy to let you know about the bugs I've encountered so far. All of these, I've experienced up until just making it to the Ashen forest, before beating the first grunt. In general there are about 5 in total, with the last one being a bit huge. I apologize in advance for the yapping, I just feel I should be as detailed as I can for explaining what and how this bugs occurred.
1. I'm unsure if it's the spawn rate itself or something else. But Pokemon will spawn in the grass as soon as you input movement and before your character moves. The only way I've been able to leave the grass when this happens is holding B and starting to run directly after a battle with a wild pokemon before the blacked out screen transition even ends.
2. The It happened twice, but I got stuck in the Delibird shop. It would not let me leave. I was held at bag-point by a virtual Delibird...
3. I noticed that sometimes when I attacked in a battle (trainer and wild), It would get stuck and the opposing pokemon would not attack. It happened a few times and I eventually found a common denominator later while trying to catch a certain pokemon (more on that later). It only happens when using Beldum's/Metang's Astonish. I'm unsure if it is only that specific pokemon or if it happens with the move in general.
4. Alright, now to the nitty griddy that unfortunately made the game unplayable and forced me to stop for now. First in the area right before the Ashen forest, directly after that bridge-over-water area, I was searching to see what pokemon could be found there. Lo' and behold, I find a wild Mudkip! That's the pokemon I was trying to catch and I assume this is on purpose and a rare spawn. While trying to catch it and soft resetting several times (because of the aforementioned Astonish bug), I eventually realized that i could no longer walk in the up direction. I could go side to side and walk down, but as soon as I walk down, I could no longer walk upwards. Since I only had to go right and down to the Ashen Forest, I pressed on anyway- which leads to the biggest bug I encountered.
5. Once in the Ashen Forest I, of course, had to go up eventually. And no amount of soft resetting fixed it. So before shutting down the entire program, I opted to just return to the title screen first to see if it fixed it. Once on the title screen, I saw your really cool feature of seeing your team stand with you while facing Rayquaza... unfortunately I noticed that a team member was missing. At this point I had a team of 4: Grovyle, Metang, Kirlia, and a new Marshtomp. On the title screen, Kirlia was missing. I just thought it was another minor bug so I didn't think much of it and dove back into the game. Sadly just going back to title didn't fix the walking bug... AND I found out that Kirlia was legitimately missing. In my party it was replaced by a Treeko sprite named "No Name" and its HP bar was reading 0/0. Along with that, my Marshtomp which was level 17, was now at level 1 and it had absolutely no moves. I immediately decided not to save and instead shutdown the program. Once I reopened it the walking bug was fixed, but the pokemon problem was not. Kirla was still gone and replaced in the manor that I said, and Marshtomp was still level one. I opened the PC to see if I could move the... "Kirlia" (Now No Name Treeko) and it did not show up. When I tried to back out of the PC, the game crashed. I reopen it again and the Kirlia/Treeko is completely gone, and I accepted the it has been banished to the shadow realm. Afterwards I catch a Vulpix (Marshtomp still is lvl 1 and has nothing so I had to swtich to another pokemon). When I tried to battle a trainer and see if Marshtomp would gain some experience from the Experience share, the game crashed after my Grovyle defeated a Pokemon. It was at that point that I decided that it was time to call it a day.