I'd like to talk a bit about priority.
Priority
We have a few options concerning priority - Vacuum Wave, Mach Punch, Sucker Punch, Quick Attack, Extremespeed, Aqua Jet, Ice Shard, Feint, and Fake Out.
Quick Attack, Vacuum Wave, and Feint aren't really competitively viable on Malaconda, so we can throw those out of this competitive discussion.
Concerning Mach Punch - Is overshadowed by Sucker Punch, and even the others. Malaconda would gain priority on Ice-types, Steel-types, and Dark-types, but none of those (besides the occasional Steel-type) make appearances on Rain teams, meaning Mach Punch isn't the most essential move on Malaconda. Leave that up to the flavor bit.
Concerning Sucker Punch - Yes yes yes yes yes. The most necessary priority. It gets STAB, and hit Lati@s super effectively, and has good BP. It's even predictable, making it non-OP. Definitely supporting it.
Concerning Ice Punch - A very hard move to decide on. While being a low BP and really starting to give it 4-moveslot syndrome, it's actually fairly helpful on Malaconda. It could even deal with a few of Rain's main Pokémon (Dragonite, Tornadus, and Thundurus). So, I would support allowing Ice Shard, because it can help make Malaconda a strong counter to these Pokémon if a team lacks one with Malaconda's niche.
Concerning Fake Out - A very helpful move. Malaconda could break Focus Sashes, and it really doesn't boost Malaconda's potential too much. I would support it, since it could be used as a scouting move, helping Malaconda's survivability.
Concerning Extremespeed - Normal-type doesn't really get enough coverage to really warrant adding this to Malaconda's movepool. It does have +2 priority, which with a Swords Dance boost or something could become potential, but with the other priority moves I've discussed, it seems like Extremespeed would just be another move adding to Malaconda's 4-moveslot syndrome, which we need to try to avoid. So I don't support Extremespeed.
Concerning Aqua Jet - Nope. No no no. This is a terrible move to put on a Pokémon with which we're attempting to boost Sun teams. Aqua Jet would gain psuedo-STAB in the Rain, and would become fairly helpful in ridding Malaconda of it's weaknesses to Fire-types. This would warrant Malaconda's use on Rain teams, which is one of the main things we're attempting to accomplish.
Priority
We have a few options concerning priority - Vacuum Wave, Mach Punch, Sucker Punch, Quick Attack, Extremespeed, Aqua Jet, Ice Shard, Feint, and Fake Out.
Quick Attack, Vacuum Wave, and Feint aren't really competitively viable on Malaconda, so we can throw those out of this competitive discussion.
Concerning Mach Punch - Is overshadowed by Sucker Punch, and even the others. Malaconda would gain priority on Ice-types, Steel-types, and Dark-types, but none of those (besides the occasional Steel-type) make appearances on Rain teams, meaning Mach Punch isn't the most essential move on Malaconda. Leave that up to the flavor bit.
Concerning Sucker Punch - Yes yes yes yes yes. The most necessary priority. It gets STAB, and hit Lati@s super effectively, and has good BP. It's even predictable, making it non-OP. Definitely supporting it.
Concerning Ice Punch - A very hard move to decide on. While being a low BP and really starting to give it 4-moveslot syndrome, it's actually fairly helpful on Malaconda. It could even deal with a few of Rain's main Pokémon (Dragonite, Tornadus, and Thundurus). So, I would support allowing Ice Shard, because it can help make Malaconda a strong counter to these Pokémon if a team lacks one with Malaconda's niche.
Concerning Fake Out - A very helpful move. Malaconda could break Focus Sashes, and it really doesn't boost Malaconda's potential too much. I would support it, since it could be used as a scouting move, helping Malaconda's survivability.
Concerning Extremespeed - Normal-type doesn't really get enough coverage to really warrant adding this to Malaconda's movepool. It does have +2 priority, which with a Swords Dance boost or something could become potential, but with the other priority moves I've discussed, it seems like Extremespeed would just be another move adding to Malaconda's 4-moveslot syndrome, which we need to try to avoid. So I don't support Extremespeed.
Concerning Aqua Jet - Nope. No no no. This is a terrible move to put on a Pokémon with which we're attempting to boost Sun teams. Aqua Jet would gain psuedo-STAB in the Rain, and would become fairly helpful in ridding Malaconda of it's weaknesses to Fire-types. This would warrant Malaconda's use on Rain teams, which is one of the main things we're attempting to accomplish.