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Heals the user by 1/2 of its maximum HP, rounded half up.
Slack Off is an excellent move, but not all of the Pokemon with access to it can use it effectively. The Infernape family, with their little bulk, can rarely afford to take a turn to heal, and should spend the turn attacking or setting up. Slaking and Slakoth can not afford to use this move due to their awful ability in Truant. Every other Pokemon who receives Slack Off is primarily used as a wall, and can utilize Slack Off to keep themselves alive and stall out the opponent with ease. This is especially true on Slowbro and Slowking, as the combined healing effects of Regenerator and Slack Off can allow the two to recover health incredibly easily.
Milk Drink is an exact equivalent.
Recover is an exact equivalent.
Softboiled is an exact equivalent.
Roost is a Flying-type equivalent that grounds the user.
Heal Order is a Bug-type equivalent.
Wish is an equivalent, but HP is recovered at the end of the second turn.
Synthesis is a Grass-type equivalent, but varies in how much it heals depending on the weather.