Well, here's some scores to get them all above 1000 feet:
Ness:
1: GtBDttB(grab the bat, dash to the bag)
2: Jump above the bag and use a PK fire(forward+B) when you are close to the ground.
3: Throw the bat up. The flames from the PK fire should keep it from flying off the stage.
4: Jump above the bag, and use a down air. Then jump up and use another down air so it hits after the snadbag lands.
5: It should have popped up in the air. Jump up again and spike it.
6: Jump up and use a down air(it should be on the ground by now) on the sandbag.
7: Okay, get ready for it to come down, and smash right+A. If the bat was at more than 80%, you did it correctly, and the sandbag will soar to 1000 feet. If the bat was at less than 80% when you swung, go back and make sure you didn't skip any steps.
Kirby:
1: GtBDttB.
2: Use a forward tilt( with the bat).
3: Run to the bag, jump, and use a down air. It should do around 15-16% damage. IMPORTANT: make sure you hold left on the control stick after useing the dair, or the sandbag will fly off the platform.
4: Repeat 4 times.
5: Swing!
Samus:
1: GtBDttB.
2: use a neutral+A with the bat.
3: Use an up tilt. If should pop up into the air a bit.
4: Wait until the sandbag lands, and use another up tilt.
5: Repeat 5 times.
6: Swing!
Zelda:
1: GtBDttB.
2: Use an upsmash.
3: Jump, throw the bat up, and when you land, use an upsmash so the bat hits during the (multiple) hits.
4: Pick up the bag, and repeat.
5: When the bag lands, pick up the bat.(If the bat disappeared, do the strat again until it doesn't). Smash.
Link:
1: Grab the bat.
2: Smash throw a boomerang to the sandbag. It should deal 16%.
3: Run to the bag, and halfway through, jump. Now smash throw a boomerang to the bag so he throws the boomerang right when he lands.
4: Repeat twice.
5: Do it again, but instead of waiting until you almost reach the ground, use the boomerang halfway through the jump. It should not hit the hit the bag, and fly to the right.
6: When the boomerang returns, throw the bat at the bag so the returning boomerang hits right after the bat, cancelling out the momentum. Now, pick up the bat, and smash.
Young link:
The same as the link strat, but you have to get closer to the bag to make his boomerang to deal 19%(!!!) damage.
Pichu:
1: GtBDttB.
2: Use an upsmash.
3: Turn around(it should have gone behind you), and use another one when it lands.
4: Repeat.
5: When it lands, go to the left side of the bag. Now get as close to the bag as you can. In fact, nudge it to the right a bit to make SURE you are the closest you can be. Now smash to the LEFT. Yes, Pichu will swing AWAY from the bag, but you should hear a "smack" sound instead of the regular "PIIIIIIIIING!!!" sound, the bag will take 8% damage, and it should soar to 1000 feet.
Pikachu:
1: Grab the bat. Go right next to the bag, and face to the left.
2: Use an upsmash. It should deal 13% and pop the bag in the air a bit.
3: Wait for it to land, and repeat.
4: Repeat 2 times.
5: See step 5 of the Pichu strategy.
Mewtwo:
1: GtBDttB.
2: Upsmash.
3: Throw the bat up. Mewtwo can throw the bat up without having to jump up.
4: Use an upsmash so the bat hits in the(multiple) hits of the upsmash/
5: Repeat.
6: When it lands, smash the bat.
Game&watch:
1: GtBDttB.
2: Upsmash.
3: Roll to the other side of the bat, and use another upsmash.
4: repeat.
5: The sandbag should be on its side.
6: Walk up to it, face left, so only G&W's arm(that's not holding the bat) is covered by the sandbag. Smash left+A. It should again make that "smack".
Marth: (this is pretty tough)
1: GtBDttB.
2: Jump backwards, and use a down air.
3: Jump, and use another down air.
4: repeat.
5: Jump, and when you are almost to the ground, use an up air. It should make a slashing sound and it should pop up into the air.
6: Repeat.
7: When the bag lands, throw the bat at the sandbag. It should bounce off the back wall towards you. Smash the bat as it comes to you.
Okay, I hope that helped you! ^_^