Name: Seedot
Availability: Seedot can be found on Route 102 with a 20% chance in Ruby at levels 3 and 4. In Emerald, it can be found with a rare 1% chance at level 3.
Stats: Seedot has bad stats across the board, with its highest stat being its defense at 50. Nuzleaf stats increase to below average, but its defenses remain bad. Shiftry finally gets good stats. Its offenses are good, and its speed is decent. Its bulk is average. Shiftry is a decently fast and powerful, mixed attacker.
Typing: Seedot's pure Grass typing gives it weaknesses to early Bug, Flying and Poison moves. Nuzleaf and Shiftry typing is a very mixed bag. On the one hand, it gives them important resistances to Ground, Electric, Water, Grass, Ghost and Dark, and even an immunity to Psychic. But on the other hand, they gain an additional Fighting weakness and are also weak to later types in Fire and Ice. Offensively, its STAB combo is much better, as it has nearly perfect coverage, aside from the Combusken and Nuzleaf lines. Dealing super-effective damage against Water, Ground, Rock, Psychic and Ghost Pokemon is great.
Movepool: Seedot's and Nuzleaf's level-up movepool is awful and very barren. Their only early Grass STAB move is the really weak Bullet Seed TM. Nuzleaf learns Nature Power upon evolution, which can become several powerful other moves but will mostly be a non-STAB Swift, as most good terrains don't come up very often. Before Nuzleaf learns its only other and also best Dark move, Faint Attack, at level 31, its only other early option for a Dark STAB move is the weak Thief TM. The Rock Tomb, Dig, Aerial Ace and Brick Break TMs can be used to give Shiftry more coverage. The Giga Drain TM is its most consistent Grass STAB move it gets but it can also go with Sunny Day and Solar Beam to make use of its potential Chlorophyll abiltiy in an attempt to sweep teams. Shiftry can also fulfill the roles of being a Cut, Strength, Flash and Rock Smash user.
Major Battles: Seedot is good against Roxanne. But unfortunately, Brawly, Wattson and Flannery are all bad for it due to its bad stats, lack of access to good moves, or type disadvantage. Norman is also bad because Nuzleaf can't evolve yet, and its bulk and weak attacks are not good enough. Winona is again a bad type matchup. The last two gyms are great matchups for Shiftry, however. After Nuzleaf and Shiftry get decent moves, they are doing well against most Pokemon of your Rival and Team Aqua and Magma. But some Fire types, Mightyenas and the Zubat line give it trouble. Shiftry is good against Phoebe of the Elite Four and can also be good against Sidney, Glacia and the Champion with Brick Break, Solar Beam and Sunny Day. Drake is not good, though.
Additional Comments: It is possible to receive a Seedot in Rustboro City in Emerald by trading a Ralts for it. While this Seedot will receive 1.5x EXP due to being a traded Pokemon, it has very bad IVs and a speed-reducing nature. A Leaf Stone to evolve Nuzleaf into Shiftry can be found on Route 119, just before the 6th gym. However, since stone evolutions lose out on further level-up moves, Shiftry won't be able to learn Extrasensory later.