Should Scraggy stay Top Tier or move down to High?
I think
Scraggy should be moved down to
high tier. Believe me, I like Scraggy, but it just can't beat some of the more important bosses due to its low speed. For example, it can't beat Shauntal's Chandelure, as it gets outsped and OHKOd. It also just doesn't hit hard enough before a moxie boost. For example, it can't OHKO Cofagrigus without a moxie boost, and since both Ghetsis and Shauntal lead with it, he can't get one. Also, since you need to run a wide lens for HJK, you can't run a more useful item such as BlackGlasses. Level 39 is also somewhat high for an evolution level; you may not be able to have a Scrafty before Lentimas, which is pretty bad, considering that that is about when NPCs switch to fully evolved pokemon. Scraggy/Scrafty just doesn't have the immediate power necessary with that dismal speed stat to cut it in top tier, and although it can be
very dangerous once it gets going, it can be tough to get it that first boost.
Should Heracross stay in High Tier or move up to Top?
Heracross, I believe should be
top tier, without a doubt. STAB Close Combat off 125 attack will hurt anything that doesn't resist it, and getting it at level 34 is just insane; it pretty much OHKOs anything that doesn't resist it until the opponents start using fully-evolved pokemon around Lentimas, and even then it will severely dent nearly everything. Not having a good bug move for a long time is somewhat disappointing, but you don't really need one once you have Close Combat. Heracross also has a pretty good defensive typing for in-game, resisting the common fighting, bug, and ground-type moves. The flying-type weakness is a bit of a problem, but that's what teammates are for, and if you're feeling daring, you can try to take them out with Rock Slide. Heracross for top.
Should Sandile stay in High Tier or move up to Top?
This is a really tough one. On one hand, this thing has one of the best offensive typings in the game, and has the speed and power to back it up. On the other, his defensive typing is downright terrible, with the only notable resist being psychic. However, I believe that
Sandile's pros outweigh its one notable con enough for it to be moved
top tier. His speed is great for in-game, and is enough to outspeed everything except stuff like Accelgor given that NPCs don't have any EVs. Sandile has enough attack to hit very hard right off the bat, and after one moxie boost, this thing can OHKO practically everything with the correct move. Ground/Dark/Rock coverage is some of the best in the game, and can hit a ton of things super effectively. This thing also destroys every gym leader in the game with the exception of Marlon, although Clay may be a bit of a problem due to his intimidate Krokorok; his typing is also fantastic for Team Plasma and the E4 (except Marshal, but you can't have everything). Fortunately, his defensive typing can be somewhat ignored due to the fact that every move you should be using except Rock Slide has 100% accuracy, so you shouldn't have to take many hits. Top tier.
Oh, and a couple of pages back, I said Riolu should be Mid-tier. Well, scratch my argument there. I ran a calc and it turns out that mine had
0 IVs in both defense and special attack, and single-digit IVs in all other stats, along with an attack-reducing nature. So yeah, talk about unlucky...