If your team has long-range crowd control such as Morgana'sDark Binding, it can sometimes pay off to put points into Rocket Grab to greatly increase the damage, as well as a much-desired cooldown decrease.
As support you will want to either max Rocket Grab or Overdrive first. Rocket Grab should be maxed for shorter cooldowns and higher damage, and Overdrive should be maxed if you need to move faster. Maxing Overdrive first means you can skip boots early, and go for your GP/10 items faster. Maxing Power Fist on support Blitzcrank is almost useless, since you won't build AD, and it only shortens the cooldown.
When playing support Blitzcrank against a squishy bot laner or a bot laner with low CC, you can walk up to the enemy AD carry or support instead of initiating with Rocket Grab. This can be done by activating Overdrive and using Power Fist when you are in range of your target. Then when your target tries to escape, use Rocket Grab to pull the target back in. This is almost always a secure kill, or at least a force of the enemy's summoner spells. When you do this, make sure your AD carry follows up. If your AD carry doesn't go in with you, you will most likely lose the trade and maybe even die.
If you know that an enemy champion plans to dodge your Rocket Grab with Flash or a dash ability, activate Static Field to silence them before grabbing.
Manamune synergizes with Blitzcrank extremely well. It increases his attack damage, and the potential 1000 mana increases the effectiveness of Mana Barrier. This item is universal in nearly every Blitzcrank build.
Muramana's toggle affects the passive portion of Static Field - each bolt deals bonus damage and consumes mana.
While increasing your DPS this can also quickly deplete your mana lowering the strength of your Mana Barrier.
Since Blitzcrank has trouble farming for gold, Aegis of the Legion can be used as a cheap and effective way to increase his survivability and usefulness to his team, especially if he's being built as a tanky-support role.
It is possible to dodge a Rocket Grab by moving perpendicular to the extended arm as it launches, causing it to miss you.
Be wary of Blitzcrank's location when he is in the bushes. He will more than likely try to initiate with Rocket Grab.
Grabbing a ward for vision in the brush counters this tactic well.
When fighting a support Blitzcrank, his damage will be much lower than his allied AD carry. Don't be afraid to force a fight if he has used Rocket Grab and/or Power Fist recently.
Be careful not to over-commit when attacking Blitzcrank. He will gain shield through his Mana Barrier when his health gets low. This can either result in Blitzcrank managing to escape from or kill you.
The best way to counter this is to wait until he drains his mana through his spells.
If you see Blitzcrank has low mana, try to go after him. He only gains a shield equal to 50% of his currentmana.
Some bottom picks, such as Ezreal, Taric or Sivir effectively counter Blitzcrank by being able to avoid or block his Rocket Grab or by being tankier and harder hitting than he is; study what champions counter and suffer against Blitzcrank to better your laning phase.
Save your channeled spells as Static Field will briefly silence you and end your channeled spell.
Beware of Blitzcrank trying to bait you. Be sure you know his Mana Barrier is not up before you chase him down.
Champions that can poke well without putting themselves in much danger, such as Varus or Caitlyn are able to harass while being considerably safer from Rocket Grab than others.
When Blitzcrank goes for an unexpected grab, usually his allies are close by. Use this to your advantage and have teammates purposefully get pulled and have teammates follow the initiate as usually the enemies swarm the person getting grabbed.