There were two so it'd be exactly 14, but I guess I'll put them back. Anyway, my set up is like before but no plains. Both Level 38 and 47/48 Nuzleaf are appearing along with Riolu and Nosepass so I'll test again

If the peak objects are gone, no Riolu. If you put the minimum required for Riolu, Nosepass will appear since the blocks are maxed out. At this point, you're going to have to try hitting all your target frames with Riolu at different slots. For example, you tried slot 8 and it appeared at none. Try removing all the plains objects, since you don't need them. Riolu will be at slot 5 then, so try all your frames and see if it shows then. My guess is if you remove the plains objects and hit the frame that gave you the level 48 Nuzleaf, it'll be Riolu because the Nuzleaf was supposed to be slot 5.

6F161FD8 is my seed
I removed the peak objects so that it would be exactly 14 (e.g. 2) Nosepass needs 18. Should I put them back so it's set to 5 forest, 7 peak and 9 plains?

Ok, so with 5 forest, 7 peak, and 9 plains Riolu would have ended up in slot 8, but that slot 8 turned out to be slot 5. Hmm. Can you give me the seed you're using, please?

Edit: How does Nosepass not appear anymore? If you didn't change the blocks it should still show up (you're probably just not hitting a frame that's slot 7).

Also didn't notice your other questions, but to answer them. I'm at Meadow, I checked and riolu did appear with the blocks maxed out

Also, Nosepass would sometimes appear, but now it doesn't either.

I use RNG reporter 9.95. I placed 5 forest, 7 peak, and 9 plains, the level is 7 (I used a code to max their levels). Nuzleaf is on Slot 5 and 8 are level 47, Slot 0 was level 38. I removed some to get 2 forest, 2 peak and 3 forest. Now Seedot doesn't appear, but Riolu doesn't either (before it could appear, but not while RNGing.) However, Raticate appears more often and so do Marill and Wooper.

That's a shame :( Which RNG Reporter version are you using? Also, do you know how many blocks of each type you placed and the levels so we can determine what slot Nuzleaf was (this way we can compare this to what RNG Reporter listed as the slot for the frames you should have gotten Riolu on, and hopefully fix this)? Finally, were all the Nuzleaf you caught level 38, or were some of them 48? Because the ones that were 38 would be a different slot from the ones that were 48.

It still could be possible to catch Riolu with that seed, since now that you know Reporter is wrong you can try to change Riolu's slot with the blocks and hit each frame and hopefully Riolu will show. If that makes sense.

Edit: Few more questions. Which area are you at, and are you sure Riolu is appearing with only 5 forest and 7 peak objects? I checked the slots and they say Riolu needs 10/14 forest/peak objects leveled after 70 days at the Meadow.

All right so I hit my seed and advanced to my frame and stuff. Riolu did not appear, and instead Nuzleaf came up in Slot 5. It was the exact IVs and ability slot I wanted on Riolu too, so the slots were wrong. The seed gave me some other slots so I'll try them out.
EDIT: 0 and 8 also got my Nuzleaf.

Thanks :)

Yeah I can. I haven't begun RNGing yet, but I can confirm leveling up blocks works exactly as it says. I have 5 forest and 7 peak, and Riolu appeared while 9 plains objects brought out Nuzleaf. I'll give you more updates as I go