No it doesn't work from any distance. Just know that if they ever attempt to sweet spot it you get a guaranteed grab as long as your shield is healthy.
Jupz I don't know here you got that info from, but it is incorrect. From our frame data thread:
Rock Smash (side):
Notes:
1. The individual 'hits' on part 3 are hard to calculate, there are 9 rocks shooting out at various points, all of which I believe can hit.
2. The 'rock' can be hit from frame 3, causing early explosion. This 'jumps' the move to frame 30. If Charizard isn't also hit the move ends the same time.
3. Only the first hit [1] incurs hitlag on Charizard, all other hits have 'projectile' properties, only applying to the opponent.
4. Second hit [2] is a TRAP, with no shield stun or hit lag, if you aren't doing anything but holding shield, you'll get hit by the shrapnal. FUX. Or if your Marth, Up B :D
Hit: 24-26 [1], 28-30 [2]; 30-50 [3]
End: 61
Hit Lag: 14 [1]; 1 [2]; 5 [3]
Shield Stun: 16 [1]; 1 [2]; 7 [3]
Advantage (shield): Anywhere from -21 to -9...
Hit Stun: 13 [1], ? [2], 24 [3]