In Jain Dharma, a sadhu gets extra-intuitive or higher perceptive powers only when the obscuring karmas of knowledge become greatly weakened or destroyed through right conduct, deep austerity, meditation, and purity of soul.

In simple words:

• Not by desire alone
• Not by external practice only
• But by karmic purification

These powers may arise as:

• Avadhi Jnana — direct perception of subtle material objects beyond ordinary senses
• Manahparyaya Jnana — knowledge of the thoughts of other beings, in limited form

Such powers appear according to the soul’s spiritual development stages (gunasthanas) and the rise, suppression, or destruction of knowledge-obscuring karma.

So, a sadhu gets strong intuitive powers when his inner purification becomes high enough and the relevant karmas are weakened or destroyed.

If you mean a specific power like avadhi jnana or manahparyaya jnana, I can explain that distinction clearly in Jain terms.