"an ever more robust" is grammatically correct and can be used in written English.
It is often used to describe something that is becoming stronger, more resilient, or more powerful over time. Example: With each passing year, technology becomes an ever more robust tool in our daily lives.
We invest in world-class broadband networks, such as our all-fiber FiOS network and our 4G LTE wireless network, to keep pace with consumers' demand and offer an ever-more-robust range of services.
As motion graphics lean towards the snappy and software grows ever more robust, "Mirage" is a music video that stands out for its restraint.
Over time, the insights gleaned from the industries currently taking advantage of AI — and improving the technology along the way — will make it ever more robust and useful within a growing range of applications.
She said: "The admission of yet more Facebook metrics errors is of concern to the news media industry, at a time when publishers are themselves investing heavily to provide advertisers with ever more robust, independent audience data.
Fortunately for today's president, America's current recovery is looking ever more robust.
Extensions of surveillance can only be justified if accompanied by much improved transparency and ever more robust oversight and scrutiny.
As people around the world become more affluent, they are demanding diets richer in animal protein, which will require ever more robust feed crop yields to sustain.
Although this trend offers many opportunities, new regulations, such as the European Community's 'Registration, Evaluation, Authorisation and Restriction of Chemicals' (REACH), demand that models be ever more robust.
To meet the president's challenge of seamless health record interoperability, we're creating ever more robust mechanisms that empower patients and their families to take control of their health data.
With the lines being blurred, retailers need to make the online experience ever more robust with better functionality, user-friendly interfaces, enhanced content, data collection and analytics, price modeling, and advanced customer communications.
Up until this point, the custom for all presidential candidates, when they visited Miami, was to promise ever stronger, ever more robust, sanctions against the "Castro regime" in order to satisfy the demands of the great potentates who control the anti-Castro industry.
