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Seed Bomb, as a relatively high powered Grass-type physical attack, allows physical attacking Grass-types like Breloom and Cacturne to have a hard-hitting STAB move. However, the most common use of Seed Bomb is on Belly Drum Linoone, where it is used to hit the Rock- and Ground-types that stand in the way of its STAB ExtremeSpeed, as well as Quagsire who otherwise nullifies Linoone's Belly Drum Attack boost.
Leaf Blade is a more powerful alternative with a high critical hit ratio.
Horn Leech is a slightly less powerful alternative which also heals the user.
Power Whip is a much more powerful alternative.