Okay. I'm going to stick to the Needs Discussion list, despite how few people are doing that...
First off, Rest. Now, I do think that if Rest is overpowered we shouldn't allow it, even though everything gets it. However, I don't really think it is. While there has been some worry that LumRest is too good, every decision that's been made since Harvest was picked was made with LumRest in mind, because it was the most promoted use of Harvest from the beginning. We've already done everything in our power to make LumRest fair, and while only the playtest will tell us if we've succeeded, I don't see any evidence we've failed. Allow Rest.
That being said, if Rest is allowed, I don't really see why Malaconda needs other recovery options. In sunlight, all of them are clearly inferior to 100% healing and status recovery at will. Outside of sunlight they add reliability, but I don't think giving non-sun teams more reliability is necessary. You could argue that they help if you lose the weather war, I suppose, but it's not as though LumRest is by any stretch of the imagination useless in non-sun weather.
The one exception to that, of course, would be if you want to use Harvest with a berry other than Lum. Sitrus, of course, adds recovery of its own so it can likely be used to reasonable effectiveness without a recovery move. With no recovery moves, Lum and Sitrus are probably the only really good berries. I think that would be a good thing. So many of the other berries completely go against the role we've set out for Malaconda. Pinch berries clearly don't work with a defensive pivot / support mon, and resist berries threaten to undermine our threatlist. For instance, with Occa Berry and maxed out special bulk, offensive Heatran has only a 24% chance to 2HKO Malaconda with Fire Blast in sun. (And that's only 17% when you factor in accuracy.) People have talked, and worried, about the ability to beat Heatran by U-turning to Dugtrio, but with Occa Berry we can actually switch in on Heatran and do that (well, 83% of the time at least).
Now obviously there's nothing we can do at this stage to prevent that possibility, and a set like that is likely to be a gimmick anyway. But that's just one of the many, many possibilities that Harvest allows with arbitrary berries. Forcing Malaconda to use Lum if it wants a recovery move makes options like that far less tempting, and that in my mind can only be a good thing. Disallow all healing moves besides Rest.
While I'm at it, I want to address a certain argument in favour of Moonlight and friends, namely that because the moves are boosted in sun they make Malaconda better on sun teams and therefore help the concept. That's a dangerous argument, and it's exactly the same one that supported Fire moves last thread, which we wisely chose to disallow anyway. Our goal isn't to make a Pokémon that is good in sun, it's to make a Pokémon that makes sun teams better. Being able to heal itself well doesn't really do that, unless it needs that healing to successfully achieve the things it was put on the team to achieve. Thus "Moonlight makes Malaconda better in sun" is a useful argument if and only if it can be demonstrated that Malaconda is not good enough on sun teams without it.
I think that ginganinja and others are right on the money with Leech Seed. The likes of specially defensive Heatran and defensive Ninetales—any special attacker that can't OHKO and doesn't carry recovery—can easily be stalled out with Leech Seed and a strong recovery move (LumRest or Moonlight). Malaconda is incredibly bulky but isn't intended as a stall-oriented Pokémon, and as such I think giving it stall-oriented moves is a mistake, especially if they can be used to successfully stall out supposed counters. Disallow Leech Seed.
Volt Switch is entirely irrelevant, but I guess I don't see any reason not to allow it.
First off, Rest. Now, I do think that if Rest is overpowered we shouldn't allow it, even though everything gets it. However, I don't really think it is. While there has been some worry that LumRest is too good, every decision that's been made since Harvest was picked was made with LumRest in mind, because it was the most promoted use of Harvest from the beginning. We've already done everything in our power to make LumRest fair, and while only the playtest will tell us if we've succeeded, I don't see any evidence we've failed. Allow Rest.
That being said, if Rest is allowed, I don't really see why Malaconda needs other recovery options. In sunlight, all of them are clearly inferior to 100% healing and status recovery at will. Outside of sunlight they add reliability, but I don't think giving non-sun teams more reliability is necessary. You could argue that they help if you lose the weather war, I suppose, but it's not as though LumRest is by any stretch of the imagination useless in non-sun weather.
The one exception to that, of course, would be if you want to use Harvest with a berry other than Lum. Sitrus, of course, adds recovery of its own so it can likely be used to reasonable effectiveness without a recovery move. With no recovery moves, Lum and Sitrus are probably the only really good berries. I think that would be a good thing. So many of the other berries completely go against the role we've set out for Malaconda. Pinch berries clearly don't work with a defensive pivot / support mon, and resist berries threaten to undermine our threatlist. For instance, with Occa Berry and maxed out special bulk, offensive Heatran has only a 24% chance to 2HKO Malaconda with Fire Blast in sun. (And that's only 17% when you factor in accuracy.) People have talked, and worried, about the ability to beat Heatran by U-turning to Dugtrio, but with Occa Berry we can actually switch in on Heatran and do that (well, 83% of the time at least).
Now obviously there's nothing we can do at this stage to prevent that possibility, and a set like that is likely to be a gimmick anyway. But that's just one of the many, many possibilities that Harvest allows with arbitrary berries. Forcing Malaconda to use Lum if it wants a recovery move makes options like that far less tempting, and that in my mind can only be a good thing. Disallow all healing moves besides Rest.
While I'm at it, I want to address a certain argument in favour of Moonlight and friends, namely that because the moves are boosted in sun they make Malaconda better on sun teams and therefore help the concept. That's a dangerous argument, and it's exactly the same one that supported Fire moves last thread, which we wisely chose to disallow anyway. Our goal isn't to make a Pokémon that is good in sun, it's to make a Pokémon that makes sun teams better. Being able to heal itself well doesn't really do that, unless it needs that healing to successfully achieve the things it was put on the team to achieve. Thus "Moonlight makes Malaconda better in sun" is a useful argument if and only if it can be demonstrated that Malaconda is not good enough on sun teams without it.
I think that ginganinja and others are right on the money with Leech Seed. The likes of specially defensive Heatran and defensive Ninetales—any special attacker that can't OHKO and doesn't carry recovery—can easily be stalled out with Leech Seed and a strong recovery move (LumRest or Moonlight). Malaconda is incredibly bulky but isn't intended as a stall-oriented Pokémon, and as such I think giving it stall-oriented moves is a mistake, especially if they can be used to successfully stall out supposed counters. Disallow Leech Seed.
Volt Switch is entirely irrelevant, but I guess I don't see any reason not to allow it.