Maybe I used "you" wrong. I meant that for these tiers, I assume that I'm not solo-ing this game with something. It may be the easiest method, but it's also boring as fuck. I know "boring and fun" is subjective, but come on. I wish Pokemon had ranks to measure on, but it doesn't, so this'll have to do.
With this logic, the Ostia and Pherae clubs in FE7 are Mid, the Thieves in High, Erk is Top and everything else is low. Why? Because Erk is probably the best candidate for solo'ing the hell out of this game thanks to 1-2 range, unless you want to go with Marcus I guess (which is possible as well).
Actually, a Sain or Kent leaving Lyn Hard Mode as a 20/1 Paladin can carry the baton quite nicely after Marcus drops it.
The problem is that Pokemon and FE aren't really comparable in this regard. In Fire Emblem, you're facing droves of enemies with a band containing multiple members. However, Pokemon is simply a series of many consecutive one-on-one encounters. Also consider that in FE, taking hits is pretty much inevitable so defensive stats (and avoid) have to be considered. However, because of Pokemon's battle mechanic, you don't need to cover a lot of stuff on the defensive end meaning that a varied team isn't necessary. And because only one guy will be on the field at any given time, it doesn't make sense for someone to be hogging experience. Whenever you invest experience in something, any time that it spends on the bench is, in essence, wasted. This is completely different from FE where while Kent is running ahead to smash the boss, Erk can pick off anything he can outrange while Oswin mops up any stragglers. You have multiple units on the field fighting multiple engagements without your direction, so it makes sense to spread them out. However, in Pokemon, only one combatant takes part in each engagement, and a level 70 Nidoking usually does the job better than a level 50 Nidoking and Blastoise. Blastoise is hogging experience and thus detracting from Nidoking's combat ability without contributing anything to the engagements that Nidoking fights. The only thing he can do is replace Blastoise in engagements, and you'd be hard pressed to find any in-game tasks that a level 50 Blastoise can perform better than a level 70 Nidoking.
Also, consider that switching Pokemon in mid-battle is something that is really only strategic during long trainer battles (like gyms and the Elite Four). In these cases, switching makes it impossible for you to utilize stat buffers, and stat buffing items are so cheap that there's really no reason not to spam them.
The one thing that raising multiple Pokemon means is that you need to gain more experience to spread among more party members. That means more battling, and possibly more grinding against wild Pokemon. And by my definition, killing wild Pokemon to get experience points is not fun at all. Fun is being able to beat the game without having to waste time fighting one-sided engagements against Machokes and Gravelers because my highest-level party member is still too underleveled to beat the first member of the Elite Four. Suppose that in Lyn mode FE, our goal was to get to get units to level 20 (because of some GC/Wii-like transfer mechanic). Raising one unit would be fun. I know from experience that Kent or Sain can reach level 20 simply by killing everything, and doing the same with Erk wouldn't be that hard. However, raising multiple units to level 20 would mean Lundgren abuse, which is about as fun as grinding against wild Pokemon.
The one point that you could argue on is PP, but Pokemon centers are placed with high frequency. RBY gives you more than enough PP restoration items, and every game after has renewable PP restoring items in the form of berries. In fact, the only time you'll find yourself needing those items is the Elite Four, which your ethers and elixirs should be able to handle. A single elixir should be more than enough to get you through Victory Road if at all necessary.
