Keen Senses. The pseudodragon has advantage on Wisdom (Perception) checks that rely on sight, hearing, or smell

Magic Resistance. The pseudodragon has advantage on saving throws against spells and other magical effects.

Telepathy. Using telepathy, the dragon can magically communicate with any creature within 120 ft. of it that can understand a language.

Familiar. The pseudodragon can serve another creature as a familiar, forming a magic, telepathic bond with that willing companion. While the two are bonded, the companion can sense what the pseudodragon senses as long as they are within 1 mile of each other. While the pseudodragon is within 10 feet of its companion, the companion shares the pseudodragon's Magic Resistance trait. At any time and for any reason, the pseudodragon can end its service as a familiar, ending the telepathic bond.

Innate Spellcasting. The Pseudodragon's innate spellcasting ability is Charisma (spell save DC 13). It can innately cast a number of spells, requiring no material components. As the dragon ages and changes color, it gains additional spells as shown below.

At will: dancing lights, mage hand, Prestidigitation

1/day each: Sleep, Mirror Image, Suggestion

 

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage.

Sting. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 4 (1d4 + 2) piercing damage, and the target must succeed on a DC 11 Constitution saving throw or become poisoned for 1 hour. If the saving throw fails by 5 or more, the target falls unconscious for the same duration, or until it takes damage or another creature uses an action to shake it awake.