Street Fighter X Tekken

Assist Gems are the purple ones, such as Auto Block, Auto Throw Escape, Easy/Super Easy Input, etc. The Easy input gems don't count unless they're activated during a combo, and the other ones cost a lot of meter and require an active partner, so I found that using gem 56 Boost Gem Extend was the best option. Combine this with a simple Boost gem that activates easily (something like connect with a launcher, connect with 5 normal moves, etc) and make sure you have 1 meter before you activate it. It's easiest to do this during arcade mode.

Assist Gems are represented with a purple gem icon within your gem loadout (), these gems can be referred to as "Beginner Mode" in Street Fighter x Tekken. Some Assist Gems are active throughout the whole match and others activate for you depending on the gem in question. While Assist Gems make things easier for beginners they also comes at a price, here is a list of the starting Assist Gems in the game, their effects and the price of using it:

If you are using the first 3 gems you will have to chain them in a combo for it to count towards your trophy, the other two on the other hand just have to activate in battle.

Grinding Method:
An easy way to grind this would be in Versus Mode utilizing the Auto Block Assist Gem and Pandora Mode with a second controller. First go into Customization and equip a character with Auto Block (preferably a big character like Hugo) then when start up versus, set it to best of 7 rounds and infinite time (the time doesn't matter but put infinite anyway). Now during character select, select who ever you want as your point character and place your character with the Gem in back, then pick any attack opponent (pick Ryu for the sake of him having a consistent ). After the characters have been selected set your point character to 25% health, leave everyone alone and start the battle. Have your point character activate Pandora Mode and once your character comes out, let the Cross Gauge fill up from Pandora and once it hits max, proceed to hitting him with the other controller and activating the Auto Block gem with each hit. After his 3 bars have been used him let him reload and you should have enough time for 3 more hits before Pandora mode time runs out. You can push your character to the corner to make it easier to connect the hits from Ryu if you want. That's 6 activations per round so under these settings that's 24 per match, rinse and repeat until you unlock your trophy.

Utilization:
While the drop in attack is quite a price to pay and losing Cross Gauge when you forget to block a move it can be handy depending on the modes you are using it in. The Easy Input Gems can help beginners in Hard difficulty trophies utilizing their characters special moves if this is the first time picking up the game, for those who want their trophies fast you can also utilize Super Easy Input with Zangief for strong command grab inputs without having to perform the 360 and 720 rotations. You can keep track of your progress towards this trophy under "Player Data" in the main menu, select Player Records and it will display your overall progress.