Gundam breaker mobile AI Marks wiki.

Marks that can be equipped to AI Pilots.
Allows you to boost an AI Pilot’s parameters by equipping a Mark to a Mark slot from the AI Pilot’s Details screen, just as you would with regular Marks.
A Mark slot will be unlocked every time an AI Pilot is tuned up to 4★ or higher.
In addition, raising its Trait/Ex Skill level to Lv 5 or 10 will unlock a slot.
(Ex: Tuning up a 1★ AI Pilot to 5★ will unlock a total of two Mark slots.
Further, increasing its Trait/EX Skills to Lv 10 will unlock two more Mark slots, making for a total of four Mark slots unlocked.)

■Getting AI Marks
Unlike regular Marks, AI Marks cannot be obtained from Builders Training.

Obtainable from a special capsule by using AI Mark Capsule Tickets, which can be obtained as Arena rewards or at the Arena Coin Exchange.

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Tuning Up Marks wiki
The rarity of a Mark can be raised using Mark Tune-Up Materials on the Mark Equipment screen.
Low-rarity Marks can be upgraded to higher rarities, and upgrading 5★ Marks to 6★ Marks will enable you to acquire extremely rare Marks, which are unavailable in Builders Training.

■Mark Tune-Up Material Acquisition
Every time you complete Builders Training, you will receive Mark Tune-Up Material α’s.
The higher-level Mark Tune-Up Materials necessary to Tune Up 2★-or-higher Marks
can be created using a Blueprint by spending Mark Tune-Up Material α’s and Awakening Circuits.

Gundam breaker mobile Growth Hangar wiki:

A system where you can set any one part in the Growth Hangar and revisit it the next day to obtain Part EXP and Part Trait/EX Skill EXP.
*You can still use the part as normal in builds even if it is set in a hangar.
The following types of hangars are available:
・Free Hangar—Available from the start.
・Ticket Hangar—Available after using a Growth Hangar Ticket.
・Course Hangar—Available after purchasing the appropriate course from the Shop.

■Obtainable EXP
With every passing day, the parts in each hangar will receive:
・+8,000 Part EXP
・+50 Part Trait/EX Skill EXP

*Parts will not receive EXP exceeding their maximum Part Lv.
*Obtained EXP subject to change depending on campaigns, Growth Hangar Tickets, and course contents.

■Obtaining EXP
Accessing the Growth Hangar every day after 5:00 AM JST will grant EXP for the parts in your hangars.
*Please be aware that parts will not receive cumulative EXP for days when you do not access the Growth Hangar.